Optimize the size and structure of an image file with our image optimization API. Leverage adaptive document learning, image analysis, and compression algorithms to optimize images in your application or custom workflows.
Use a simple API to sign and validate documents in your own platform, or automate it with tools like Zapier — without dealing with complex signature logic or infrastructure.
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This example will optimize and compress your document.
Try it out in three steps
document.pdf to your project folder.result.pdf to see the output.curl -X POST https://api.nutrient.io/build \ -H "Authorization: Bearer your_api_key_here" \ -o result.pdf \ --fail \ -F document=@document.pdf \ -F instructions='{ "parts": [ { "file": "document" } ], "output": { "type": "pdf", "optimize": { "disableImages": false, "mrcCompression": true, "imageOptimizationQuality": 2 } } }'curl -X POST https://api.nutrient.io/build ^ -H "Authorization: Bearer your_api_key_here" ^ -o result.pdf ^ --fail ^ -F document=@document.pdf ^ -F instructions="{\"parts\": [{\"file\": \"document\"}], \"output\": {\"type\": \"pdf\", \"optimize\": {\"disableImages\": false, \"mrcCompression\": true, \"imageOptimizationQuality\": 2}}}"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( "document", "document.pdf", RequestBody.create( MediaType.parse("application/pdf"), new File("document.pdf") ) ) .addFormDataPart( "instructions", new JSONObject() .put("parts", new JSONArray() .put(new JSONObject() .put("file", "document") ) ) .put("output", new JSONObject() .put("type", "pdf") .put("optimize", new JSONObject() .put("disableImages", false) .put("mrcCompression", true) .put("imageOptimizationQuality", 2) ) ).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.pdf"), 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("document", "document.pdf") .AddParameter("instructions", new JsonObject { ["parts"] = new JsonArray { new JsonObject { ["file"] = "document" } }, ["output"] = new JsonObject { ["type"] = "pdf", ["optimize"] = new JsonObject { ["disableImages"] = false, ["mrcCompression"] = true, ["imageOptimizationQuality"] = 2 } } }.ToString());
request.AdvancedResponseWriter = (responseStream, response) => { if (response.StatusCode == HttpStatusCode.OK) { using (responseStream) { using var outputFileWriter = File.OpenWrite("result.pdf"); 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: "document" } ], output: { type: "pdf", optimize: { disableImages: false, mrcCompression: true, imageOptimizationQuality: 2 } }}))formData.append('document', fs.createReadStream('document.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.pdf")) } 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 requestsimport json
response = requests.request( 'POST', 'https://api.nutrient.io/build', headers = { 'Authorization': 'Bearer your_api_key_here' }, files = { 'document': open('document.pdf', 'rb') }, data = { 'instructions': json.dumps({ 'parts': [ { 'file': 'document' } ], 'output': { 'type': 'pdf', 'optimize': { 'disableImages': False, 'mrcCompression': True, 'imageOptimizationQuality': 2 } } }) }, stream = True)
if response.ok: with open('result.pdf', 'wb') as fd: for chunk in response.iter_content(chunk_size=8096): fd.write(chunk)else: print(response.text) exit()<?php
$FileHandle = fopen('result.pdf', '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": "document" } ], "output": { "type": "pdf", "optimize": { "disableImages": false, "mrcCompression": true, "imageOptimizationQuality": 2 } } }', 'document' => new CURLFILE('document.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/1.1Content-Type: multipart/form-data; boundary=--customboundaryAuthorization: Bearer your_api_key_here
--customboundaryContent-Disposition: form-data; name="instructions"Content-Type: application/json
{ "parts": [ { "file": "document" } ], "output": { "type": "pdf", "optimize": { "disableImages": false, "mrcCompression": true, "imageOptimizationQuality": 2 } }}--customboundaryContent-Disposition: form-data; name="document"; filename="document.pdf"Content-Type: application/pdf
(document data)--customboundary--Reduce large, image-heavy PDFs without sacrificing clarity. The image optimization API uses advanced mixed raster content (MRC) compression to intelligently segment text, graphics, and images — applying the optimal compression method to each layer. The result: dramatically smaller files with preserved readability and visual fidelity.
Industry-standard mixed raster content (MRC) techniques optimized for document workflows.
Automatically prevents quality loss by separating text, graphics, and photographic elements before compression.
Reduce PDF file size while maintaining sharp text and clean visuals.
Ideal for structured business documents combining scanned pages, vector graphics, and embedded images.
Most common next steps
After validating image optimization, continue to:
No input or resulting documents are stored on our infrastructure. All files are deleted as soon as a request finishes. Alternatively, check out our self-hosted product.
All communication between your application and Nutrient is done via HTTPS to ensure your data is encrypted when it’s sent to us.
All payments are handled by Paddle. Nutrient DWS Processor API never has direct access to any of your payment data.
Create an account to get your DWS Processor API key and start making API calls.