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Compress PDF File Online for Free

Set your target DPI and JPEG quality to reduce your PDF file size fast

A free online PDF compressor that reduces your PDF file size by downsampling embedded images to your target DPI. Simply upload your PDF, adjust the target DPI and JPEG quality settings to control the compression level, and download your optimized PDF instantly. Perfect for web uploads, email attachments, and storage optimization.

How to Compress PDF Online in 3 Steps

1. Upload Your PDF

Click to select or drag and drop your PDF file into the tool. All processing happens locally in your browser, nothing is uploaded to any server.

2. Set Your Compression Settings

Adjust the target DPI and JPEG quality sliders to control the balance between file size reduction and image quality.

3. Compress & Download

Click Compress PDF and download your optimized, reduced-size PDF instantly.

Why Use Our PDF Compressor Tool?

The fastest way to reduce PDF file size online.

⚡

Lightning Fast

Upload your PDF, set your compression settings, and download your reduced-size file in seconds.

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100% Free

No hidden fees, no subscription required. Compress as many PDFs as you need, completely free.

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100% Private

All processing happens locally in your browser using WebAssembly technology. Your PDF is never uploaded to any server ever.

🎚️

Full Compression Control

Set your target DPI and JPEG quality to find the perfect balance between file size reduction and image quality.

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Significant File Size Reduction

PDFs with high-resolution scans or photographs can often be reduced by 50–90% depending on the original content.

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Works on Any Device

Fully browser-based, no installation needed. Works on desktop, tablet, and mobile.

Build Document Automation That Scales With APITemplate

APITemplate is an API-first platform that generates professional PDFs and images at scale from reusable templates, raw HTML, or URLs. Integrate via REST API, SDKs, or no-code tools like Zapier, Make, and n8n.

Create Document Templates with Visual Editor

Create stunning PDFs using our  WYSIWYG Template Editor. With its user-friendly interface, you can design templates visually — no coding required.

Combine your designs with JSON data to generate dynamic, fully-customized PDFs tailored to your needs. Perfect for invoices, reports, certificates, and more.

Explore PDF Generation API

Convert HTML to PDF

Convert HTML to PDF using APITemplate.io’s powerful HTML Template Editor. Combine your HTML, CSS, and JavaScript skills with dynamic JSON data to create custom templates that deliver pixel-perfect PDFs.

Our PDF generation solution supports modern web technologies, enabling seamless integration for your automated workflows, reports, and more.

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Customer Reviews

Trusted by businesses worldwide to generate millions of PDFs and images reliably.

See what our customers have to say
We are very grateful to Jacky and the team at APITemplate - their software has helped us to auto-generate high quality images for our student reports.

It has been the perfect fit for us as we grow our Oxford summer school.
Jamie Dear
Jamie DearFounder
We've successfully automated YouTube thumbnails and match event creation for our Powerchair Football league using your templates. It integrates with our Postgres database on retool.com, is expanding to include league table graphics and match results.

Thanks to an AWS Inclusion and Diversity grant, we're enhancing our live-streaming workflow, further boosted by your product's automation capabilities.

We're grateful for your excellent service and wanted to share our positive experience.
Alex Dowding
Alex DowdingVice Secretary
At askreferral.io, We are building referral networking platform for people to pitch and generate leads for different kinds of referrals, including, but not limited to job referrals, product referrals, funding referrals, realtor referrals etc.

Having a vibrant social media community is crucial for our growth and APITemplate.io played crucial role in automating generation of digital posters for job postings, profile pitches, funding requests etc, to help us grow from 0 to 200K+ followers in LinkedIn in less than one year.
Nishitha Dhanekula
Nishitha DhanekulaCofounder /CTO
We've been using APITemplate.io to generate social images for our karting races and it's been a huge time-saver. The support team is super responsive and helpful - they quickly resolved an issue we encountered. We highly recommend this tool to anyone who needs a similar solution.
Danaé Nicolas
Danaé NicolasCTO
APITemplate.io is such an easy application to use. Simple, intuititive, and code free. At simplehuman, we render all our commercial invoices, dispatch notes, and multiple other templates. The ability to create multiple layouts, and group them into a logical container - makes our lives much simpler.

This is a great tool to use, both affordable, and the support service turnaround time is second to none!

Defintely worth the subscription!
Ryan Turnbull
Ryan TurnbullIT Manager
Had an issue with template implementation via Make and reached out for support. Within minutes, I got a response and was soon on a Zoom call resolving it.

Despite the issue not being directly related to APITemplate.io, their team efficiently guided me to the right formatting. Many thanks!
Ron P.
Ron P.Product Manager
We have been using the service daily in our application for a year and are very satisfied with the reliability.

It meets all our requirements and requests for changes/improvements can be discussed directly with Jacky 1:1.

Thanks and greetings from Germany
Nicholas Gertz
Nicholas GertzProduct Owner
We use APITemplate to generate key documentation we need to work with our industry partners.

We are building a digital solution in an antiquated industry, which means we need to communicate data to our partners in the format that they are accustomed to (pdf forms).

APITempate makes it easy for us to do this!
Lucas Fridman
Lucas Fridman Chief Product Officer
We love APITemplate.io for its simplicity and ease of use. Just setup once and "forget" about it due to its fabulous 3rd party integration.

New features are regularly added, and reasonable custom requests are honoured within days.
Jean-Paul Horn
Jean-Paul HornPublisher
APITemplate.io is one of the best services I have worked with in a very, very long time. They are super responsive and a joy to work with.

If you are struggling with PDF's, like I was, check 'em out!
Kevin Frickē
Kevin Frickē
We run conferences with a number of speakers, each requiring an individual speaker profile. We used to create all of these profiles manually, but by incorporating APItemplate into our Zapier workflow, our team can generate a complete image with all of the speakers information in one click.

Using the template editor is a bit of a learning curve, but the support team is very responsive and helpful.
Jacob Monash
Jacob MonashAutomation Specialist
APITemplate.io is great. I love being able to quickly use HTML and CSS templates with dynamic variables to create documents.

Support is also fast and responsive.

Great vendor!
George Cooper
George Cooper-
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Frequently asked questions

What is a PDF compressor tool? 

A PDF compressor is a free online tool that reduces the file size of your PDF by downsampling embedded images to a target DPI and adjusting JPEG quality

How does compressing a PDF work? 

The tool reduces file size by resampling images embedded in your PDF to a lower DPI and re-encoding them as optimized JPEGs. Text, shapes, and vector elements remain completely unchanged and sharp at any zoom level.

How much can I reduce my PDF file size? 

It depends on the content of your PDF. Documents with high-resolution scans or photographs can often be reduced by 50–90%. PDFs with already-optimized images or vector graphics will see smaller reductions.

What DPI should I use for compression? 

It depends on your use case. For web and email, 150 DPI with 75% JPEG quality offers a good balance between file size and quality. For printing, you may want to keep DPI higher to maintain image sharpness.

Will compressing my PDF affect the text or vector content? 

No. The tool only processes raster images such as photos and scans embedded in the PDF. Text, shapes, and paths remain completely untouched and sharp regardless of compression settings.

Is it safe to upload confidential documents to compress them? 

Yes. All processing happens entirely in your browser using WebAssembly technology. Your PDF is never uploaded to any server. Your files stay completely private on your device.

Can I check the DPI of my PDF images before compressing? 

Yes. Use our free PDF DPI Analyzer to check the DPI of all embedded images in your PDF before deciding on your compression settings.

Can I lock or password-protect my compressed PDF before sharing? 

Yes. After compressing, use our free Lock/Unlock PDF tool to add password protection to your document for an extra layer of security.

 

What is APITemplate.io?

APITemplate.io is designed for generating PDF documents from reusable templates. It can be easily integrated with popular tools like Zapier, Airtable, Make.com, Bubble.io, n8n, UiPath, or directly via REST API, making it highly adaptable to various workflows.

There are three main ways to generate PDF documents using APITemplate.io:

  1. Template-based PDF generation: Create PDFs from predefined templates.
  2. HTML to PDF generation: Convert HTML content directly into PDF format.
  3. URL to PDF generation: Convert entire web pages to PDFs by simply providing their URLs.

 

The platform also supports custom CSS and JavaScript, allowing for advanced styling and customization. Its powerful template engine ensures that you can create complex documents efficiently, while the API Console enables you to preview and customize JSON data instantly.

In addition, APITemplate.io offers support for adding custom headers and footers, including page numbers and total page counts, making it an excellent choice for creating polished, professional PDF documents.

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