PDF to Markup C# API
Convert PDF files to HTML and Markdown using our C# PDF to Markup API.
Convert from
Convert to
Try It Out
This example will convert your uploaded PDF file to an HTML.
Use Your Free API Calls
Sign up and receive 200 credits / month for free, or log in to automatically add your API key to sample code. If you are not sure how credits are consumed read more in our pricing documentation , or check out this guide on calculating credit usage.
Add a File
Add a PDF file named input.pdf to your project folder. You can also use our sample file.
The file name is case sensitive. Make sure the file name matches the file name in the sample code.
Run the Code
Copy the code and run it from the same folder you added the files to. For more information, see our language-specific getting started guides.
View the Results
Open
result.html
in your project folder to view the results.
curl -X POST https://api.nutrient.io/build \
-H "Authorization: Bearer your_api_key_here" \
-o result.html \
--fail \
-F file=@input.pdf \
-F instructions='{
"parts": [
{
"file": "file"
}
],
"output": {
"type": "html"
}
}'
curl -X POST https://api.nutrient.io/build ^
-H "Authorization: Bearer your_api_key_here" ^
-o result.html ^
--fail ^
-F file=@input.pdf ^
-F instructions="{\"parts\": [{\"file\": \"file\"}], \"output\": {\"type\": \"html\"}}"
package com.example.pspdfkit;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import org.json.JSONArray;
import org.json.JSONObject;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
public final class PspdfkitApiExample {
public static void main(final String[] args) throws IOException {
final RequestBody body = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart(
"file",
"input.pdf",
RequestBody.create(
MediaType.parse("application/pdf"),
new File("input.pdf")
)
)
.addFormDataPart(
"instructions",
new JSONObject()
.put("parts", new JSONArray()
.put(new JSONObject()
.put("file", "file")
)
)
.put("output", new JSONObject()
.put("type", "html")
).toString()
)
.build();
final Request request = new Request.Builder()
.url("https://api.nutrient.io/build")
.method("POST", body)
.addHeader("Authorization", "Bearer your_api_key_here")
.build();
final OkHttpClient client = new OkHttpClient()
.newBuilder()
.build();
final Response response = client.newCall(request).execute();
if (response.isSuccessful()) {
Files.copy(
response.body().byteStream(),
FileSystems.getDefault().getPath("result.html"),
StandardCopyOption.REPLACE_EXISTING
);
} else {
// Handle the error
throw new IOException(response.body().string());
}
}
}
using System;
using System.IO;
using System.Net;
using RestSharp;
namespace PspdfkitApiDemo
{
class Program
{
static void Main(string[] args)
{
var client = new RestClient("https://api.nutrient.io/build");
var request = new RestRequest(Method.POST)
.AddHeader("Authorization", "Bearer your_api_key_here")
.AddFile("file", "input.pdf")
.AddParameter("instructions", new JsonObject
{
["parts"] = new JsonArray
{
new JsonObject
{
["file"] = "file"
}
},
["output"] = new JsonObject
{
["type"] = "html"
}
}.ToString());
request.AdvancedResponseWriter = (responseStream, response) =>
{
if (response.StatusCode == HttpStatusCode.OK)
{
using (responseStream)
{
using var outputFileWriter = File.OpenWrite("result.html");
responseStream.CopyTo(outputFileWriter);
}
}
else
{
var responseStreamReader = new StreamReader(responseStream);
Console.Write(responseStreamReader.ReadToEnd());
}
};
client.Execute(request);
}
}
}
// This code requires Node.js. Do not run this code directly in a web browser.
const axios = require('axios')
const FormData = require('form-data')
const fs = require('fs')
const formData = new FormData()
formData.append('instructions', JSON.stringify({
parts: [
{
file: "file"
}
],
output: {
type: "html"
}
}))
formData.append('file', fs.createReadStream('input.pdf'))
;(async () => {
try {
const response = await axios.post('https://api.nutrient.io/build', formData, {
headers: formData.getHeaders({
'Authorization': 'Bearer your_api_key_here'
}),
responseType: "stream"
})
response.data.pipe(fs.createWriteStream("result.html"))
} catch (e) {
const errorString = await streamToString(e.response.data)
console.log(errorString)
}
})()
function streamToString(stream) {
const chunks = []
return new Promise((resolve, reject) => {
stream.on("data", (chunk) => chunks.push(Buffer.from(chunk)))
stream.on("error", (err) => reject(err))
stream.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")))
})
}
import requests
import json
response = requests.request(
'POST',
'https://api.nutrient.io/build',
headers = {
'Authorization': 'Bearer your_api_key_here'
},
files = {
'file': open('input.pdf', 'rb')
},
data = {
'instructions': json.dumps({
'parts': [
{
'file': 'file'
}
],
'output': {
'type': 'html'
}
})
},
stream = True
)
if response.ok:
with open('result.html', 'wb') as fd:
for chunk in response.iter_content(chunk_size=8096):
fd.write(chunk)
else:
print(response.text)
exit()
<?php
$FileHandle = fopen('result.html', 'w+');
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => 'https://api.nutrient.io/build',
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_POSTFIELDS => array(
'instructions' => '{
"parts": [
{
"file": "file"
}
],
"output": {
"type": "html"
}
}',
'file' => new CURLFILE('input.pdf')
),
CURLOPT_HTTPHEADER => array(
'Authorization: Bearer your_api_key_here'
),
CURLOPT_FILE => $FileHandle,
));
$response = curl_exec($curl);
curl_close($curl);
fclose($FileHandle);
POST https://api.nutrient.io/build HTTP/1.1
Content-Type: multipart/form-data; boundary=--customboundary
Authorization: Bearer your_api_key_here
--customboundary
Content-Disposition: form-data; name="instructions"
Content-Type: application/json
{
"parts": [
{
"file": "file"
}
],
"output": {
"type": "html"
}
}
--customboundary
Content-Disposition: form-data; name="file"; filename="input.pdf"
Content-Type: application/pdf
(file data)
--customboundary--
Your API key
Get access to your API key when you create an account. Once your account has been created, you’ll get 200 credits / month for free.
Your API key has automatically been inserted into the API example code. Run the sample code in your terminal to execute the API call.
Try It Out
This example will convert your uploaded PDF file to an MD.
Use Your Free API Calls
Sign up and receive 200 credits / month for free, or log in to automatically add your API key to sample code. If you are not sure how credits are consumed read more in our pricing documentation , or check out this guide on calculating credit usage.
Add a File
Add a PDF file named input.pdf to your project folder. You can also use our sample file.
The file name is case sensitive. Make sure the file name matches the file name in the sample code.
Run the Code
Copy the code and run it from the same folder you added the files to. For more information, see our language-specific getting started guides.
View the Results
Open
result.md
in your project folder to view the results.
curl -X POST https://api.nutrient.io/build \
-H "Authorization: Bearer your_api_key_here" \
-o result.md \
--fail \
-F file=@input.pdf \
-F instructions='{
"parts": [
{
"file": "file"
}
],
"output": {
"type": "markdown"
}
}'
curl -X POST https://api.nutrient.io/build ^
-H "Authorization: Bearer your_api_key_here" ^
-o result.md ^
--fail ^
-F file=@input.pdf ^
-F instructions="{\"parts\": [{\"file\": \"file\"}], \"output\": {\"type\": \"markdown\"}}"
package com.example.pspdfkit;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
import org.json.JSONArray;
import org.json.JSONObject;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
public final class PspdfkitApiExample {
public static void main(final String[] args) throws IOException {
final RequestBody body = new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart(
"file",
"input.pdf",
RequestBody.create(
MediaType.parse("application/pdf"),
new File("input.pdf")
)
)
.addFormDataPart(
"instructions",
new JSONObject()
.put("parts", new JSONArray()
.put(new JSONObject()
.put("file", "file")
)
)
.put("output", new JSONObject()
.put("type", "markdown")
).toString()
)
.build();
final Request request = new Request.Builder()
.url("https://api.nutrient.io/build")
.method("POST", body)
.addHeader("Authorization", "Bearer your_api_key_here")
.build();
final OkHttpClient client = new OkHttpClient()
.newBuilder()
.build();
final Response response = client.newCall(request).execute();
if (response.isSuccessful()) {
Files.copy(
response.body().byteStream(),
FileSystems.getDefault().getPath("result.md"),
StandardCopyOption.REPLACE_EXISTING
);
} else {
// Handle the error
throw new IOException(response.body().string());
}
}
}
using System;
using System.IO;
using System.Net;
using RestSharp;
namespace PspdfkitApiDemo
{
class Program
{
static void Main(string[] args)
{
var client = new RestClient("https://api.nutrient.io/build");
var request = new RestRequest(Method.POST)
.AddHeader("Authorization", "Bearer your_api_key_here")
.AddFile("file", "input.pdf")
.AddParameter("instructions", new JsonObject
{
["parts"] = new JsonArray
{
new JsonObject
{
["file"] = "file"
}
},
["output"] = new JsonObject
{
["type"] = "markdown"
}
}.ToString());
request.AdvancedResponseWriter = (responseStream, response) =>
{
if (response.StatusCode == HttpStatusCode.OK)
{
using (responseStream)
{
using var outputFileWriter = File.OpenWrite("result.md");
responseStream.CopyTo(outputFileWriter);
}
}
else
{
var responseStreamReader = new StreamReader(responseStream);
Console.Write(responseStreamReader.ReadToEnd());
}
};
client.Execute(request);
}
}
}
// This code requires Node.js. Do not run this code directly in a web browser.
const axios = require('axios')
const FormData = require('form-data')
const fs = require('fs')
const formData = new FormData()
formData.append('instructions', JSON.stringify({
parts: [
{
file: "file"
}
],
output: {
type: "markdown"
}
}))
formData.append('file', fs.createReadStream('input.pdf'))
;(async () => {
try {
const response = await axios.post('https://api.nutrient.io/build', formData, {
headers: formData.getHeaders({
'Authorization': 'Bearer your_api_key_here'
}),
responseType: "stream"
})
response.data.pipe(fs.createWriteStream("result.md"))
} catch (e) {
const errorString = await streamToString(e.response.data)
console.log(errorString)
}
})()
function streamToString(stream) {
const chunks = []
return new Promise((resolve, reject) => {
stream.on("data", (chunk) => chunks.push(Buffer.from(chunk)))
stream.on("error", (err) => reject(err))
stream.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")))
})
}
import requests
import json
response = requests.request(
'POST',
'https://api.nutrient.io/build',
headers = {
'Authorization': 'Bearer your_api_key_here'
},
files = {
'file': open('input.pdf', 'rb')
},
data = {
'instructions': json.dumps({
'parts': [
{
'file': 'file'
}
],
'output': {
'type': 'markdown'
}
})
},
stream = True
)
if response.ok:
with open('result.md', 'wb') as fd:
for chunk in response.iter_content(chunk_size=8096):
fd.write(chunk)
else:
print(response.text)
exit()
<?php
$FileHandle = fopen('result.md', 'w+');
$curl = curl_init();
curl_setopt_array($curl, array(
CURLOPT_URL => 'https://api.nutrient.io/build',
CURLOPT_CUSTOMREQUEST => 'POST',
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => '',
CURLOPT_POSTFIELDS => array(
'instructions' => '{
"parts": [
{
"file": "file"
}
],
"output": {
"type": "markdown"
}
}',
'file' => new CURLFILE('input.pdf')
),
CURLOPT_HTTPHEADER => array(
'Authorization: Bearer your_api_key_here'
),
CURLOPT_FILE => $FileHandle,
));
$response = curl_exec($curl);
curl_close($curl);
fclose($FileHandle);
POST https://api.nutrient.io/build HTTP/1.1
Content-Type: multipart/form-data; boundary=--customboundary
Authorization: Bearer your_api_key_here
--customboundary
Content-Disposition: form-data; name="instructions"
Content-Type: application/json
{
"parts": [
{
"file": "file"
}
],
"output": {
"type": "markdown"
}
}
--customboundary
Content-Disposition: form-data; name="file"; filename="input.pdf"
Content-Type: application/pdf
(file data)
--customboundary--
Your API key
Get access to your API key when you create an account. Once your account has been created, you’ll get 200 credits / month for free.
Your API key has automatically been inserted into the API example code. Run the sample code in your terminal to execute the API call.
Rendering a Single Page
The default is to render the first page, but you can also render any other page of the document by adding the
pages
option.
This will render the fifth page (remember pages are indexed starting from 0):
"output": {
"type": "image",
"pages": {"start": 4, "end": 4},
"format": "png",
"width": 500
}
Rendering Multiple Pages
In addition to rendering just a single page (the default is the first), you can also render multiple pages at
the same time. Simply add the pages option.
Note:
You can only render 50 pages in a single request. Requesting more than 50 pages will result in a
status 400
being returned.
The following example will return a ZIP file containing all pages:
"output": {
"type": "image",
"pages": {"start": 0, "end": -1},
"format": "png",
"width": 500
}
You can also render a subset of pages. This will render pages 2, 3, and 4:
"output": {
"type": "image",
"pages": {"start": 1, "end": 3},
"format": "png",
"width": 500
}
The files in the ZIP file will be named <page_number>.png
Controlling Image Dimensions
You can give the output images a specific width or height, or you can render them with a specific resolution.
You can only choose one of those three options. Specifying more than one will result in a status
400
being returned.
Depending on which option you choose, one or both dimensions will be determined based on the dimensions of the page in the document. The following will go into detail about each of the three options.
Note:
There is a limit to the final resolution of the resulting images. Any image is not allowed to be
bigger than 34 million pixels (4960×7016px), regardless of the aspect ratio. Requesting a bigger image will
result in a status 400
being returned.
You can specify the width
. In this case, all rendered pages will have the same width, but they’ll
have varying heights depending on the page dimensions in the document:
"output": {
"type": "image",
"format": "png",
"width": 768
}
You can specify the height
. In this case, all rendered pages will have the same height, but they’ll
have varying widths depending on the page dimensions in the document:
"output": {
"type": "image",
"format": "png",
"height": 1024
}
And finally, you can specify the dpi
. In this case, the width and height of the rendered pages
depends only on the page dimensions:
"output": {
"type": "image",
"format": "png",
"dpi": 72
}
Rendering a Single Page
The default is to render the first page, but you can also render any other page of the document by adding the
pages
option.
This will render the fifth page (remember pages are indexed starting from 0):
"output": {
"type": "image",
"pages": {"start": 4, "end": 4},
"format": "jpg",
"width": 500
}
Rendering Multiple Pages
In addition to rendering just a single page (the default is the first), you can also render multiple pages at
the same time. Simply add the pages option.
Note:
You can only render 50 pages in a single request. Requesting more than 50 pages will result in a
status 400
being returned.
The following example will return a ZIP file containing all pages:
"output": {
"type": "image",
"pages": {"start": 0, "end": -1},
"format": "jpg",
"width": 500
}
You can also render a subset of pages. This will render pages 2, 3, and 4:
"output": {
"type": "image",
"pages": {"start": 1, "end": 3},
"format": "jpg",
"width": 500
}
The files in the ZIP file will be named <page_number>.jpg
Controlling Image Dimensions
You can give the output images a specific width or height, or you can render them with a specific resolution.
You can only choose one of those three options. Specifying more than one will result in a status
400
being returned.
Depending on which option you choose, one or both dimensions will be determined based on the dimensions of the page in the document. The following will go into detail about each of the three options.
Note:
There is a limit to the final resolution of the resulting images. Any image is not allowed to be
bigger than 34 million pixels (4960×7016px), regardless of the aspect ratio. Requesting a bigger image will
result in a status 400
being returned.
You can specify the width
. In this case, all rendered pages will have the same width, but they’ll
have varying heights depending on the page dimensions in the document:
"output": {
"type": "image",
"format": "jpg",
"width": 768
}
You can specify the height
. In this case, all rendered pages will have the same height, but they’ll
have varying widths depending on the page dimensions in the document:
"output": {
"type": "image",
"format": "jpg",
"height": 1024
}
And finally, you can specify the dpi
. In this case, the width and height of the rendered pages
depends only on the page dimensions:
"output": {
"type": "image",
"format": "jpg",
"dpi": 72
}
Rendering a Single Page
The default is to render the first page, but you can also render any other page of the document by adding the
pages
option.
This will render the fifth page (remember pages are indexed starting from 0):
"output": {
"type": "image",
"pages": {"start": 4, "end": 4},
"format": "webp",
"width": 500
}
Rendering Multiple Pages
In addition to rendering just a single page (the default is the first), you can also render multiple pages at
the same time. Simply add the pages option.
Note:
You can only render 50 pages in a single request. Requesting more than 50 pages will result in a
status 400
being returned.
The following example will return a ZIP file containing all pages:
"output": {
"type": "image",
"pages": {"start": 0, "end": -1},
"format": "webp",
"width": 500
}
You can also render a subset of pages. This will render pages 2, 3, and 4:
"output": {
"type": "image",
"pages": {"start": 1, "end": 3},
"format": "webp",
"width": 500
}
The files in the ZIP file will be named <page_number>.webp
Controlling Image Dimensions
You can give the output images a specific width or height, or you can render them with a specific resolution.
You can only choose one of those three options. Specifying more than one will result in a status
400
being returned.
Depending on which option you choose, one or both dimensions will be determined based on the dimensions of the page in the document. The following will go into detail about each of the three options.
Note:
There is a limit to the final resolution of the resulting images. Any image is not allowed to be
bigger than 34 million pixels (4960×7016px), regardless of the aspect ratio. Requesting a bigger image will
result in a status 400
being returned.
You can specify the width
. In this case, all rendered pages will have the same width, but they’ll
have varying heights depending on the page dimensions in the document:
"output": {
"type": "image",
"format": "webp",
"width": 768
}
You can specify the height
. In this case, all rendered pages will have the same height, but they’ll
have varying widths depending on the page dimensions in the document:
"output": {
"type": "image",
"format": "webp",
"height": 1024
}
And finally, you can specify the dpi
. In this case, the width and height of the rendered pages
depends only on the page dimensions:
"output": {
"type": "image",
"format": "webp",
"dpi": 72
}
Rendering a Single Page
The default is to render the first page, but you can also render any other page of the document by adding the
pages
option.
This will render the fifth page (remember pages are indexed starting from 0):
"output": {
"type": "image",
"pages": {"start": 4, "end": 4},
"format": "tiff",
"width": 500
}
Rendering Multiple Pages
In addition to rendering just a single page (the default is the first), you can also render multiple pages at
the same time. Simply add the pages option.
Note:
You can only render 50 pages in a single request. Requesting more than 50 pages will result in a
status 400
being returned.
The following example will return a ZIP file containing all pages:
"output": {
"type": "image",
"pages": {"start": 0, "end": -1},
"format": "tiff",
"width": 500
}
You can also render a subset of pages. This will render pages 2, 3, and 4:
"output": {
"type": "image",
"pages": {"start": 1, "end": 3},
"format": "tiff",
"width": 500
}
The files in the ZIP file will be named <page_number>.tiff
Controlling Image Dimensions
You can give the output images a specific width or height, or you can render them with a specific resolution.
You can only choose one of those three options. Specifying more than one will result in a status
400
being returned.
Depending on which option you choose, one or both dimensions will be determined based on the dimensions of the page in the document. The following will go into detail about each of the three options.
Note:
There is a limit to the final resolution of the resulting images. Any image is not allowed to be
bigger than 34 million pixels (4960×7016px), regardless of the aspect ratio. Requesting a bigger image will
result in a status 400
being returned.
You can specify the width
. In this case, all rendered pages will have the same width, but they’ll
have varying heights depending on the page dimensions in the document:
"output": {
"type": "image",
"format": "tiff",
"width": 768
}
You can specify the height
. In this case, all rendered pages will have the same height, but they’ll
have varying widths depending on the page dimensions in the document:
"output": {
"type": "image",
"format": "tiff",
"height": 1024
}
And finally, you can specify the dpi
. In this case, the width and height of the rendered pages
depends only on the page dimensions:
"output": {
"type": "image",
"format": "tiff",
"dpi": 72
}