6 Best Free PDF Compressors Online: 2026 Comparison

Best free PDF compressors reduce a document's file size while keeping text and images readable. This comparison reviews each tool's published features, privacy model, limits, and controls so you can choose the right option for a resume or general document.

What Is the Best Free PDF Compressor?

EasyResume is the best fit for a private resume PDF under 5MB because it processes the file in your browser. PDF24 is better when you want detailed quality controls without a stated daily limit, while Adobe Acrobat is useful for very large PDFs and simple compression presets.

Tool	Best for	Published free limit or model	Processing
EasyResume	Private resume PDFs	5MB per file	In your browser
Smallpdf	Simple basic compression	Usage limits may apply	Cloud
iLovePDF	Three compression levels	Free web tool	Cloud
Adobe Acrobat	Large files	Up to 2GB per file	Cloud
PDF24	Detailed controls	No stated daily limit	Cloud
Sejda	Image quality and PPI control	3 tasks per hour, up to 100MB	Cloud

1. EasyResume PDF Compressor

EasyResume's PDF Compressor is designed for documents such as resumes, cover letters, and application files. It processes PDFs locally in the browser, displays the original and compressed sizes, and downloads the result without sending the file to an EasyResume server.

Choose it when: privacy matters and your PDF is 5MB or smaller. It has no account requirement or daily task counter.

Consider another tool when: the source file exceeds 5MB or you need manual control over image resolution.

2. Smallpdf Compress PDF

Smallpdf's official compressor page lists Basic, Moderate, and Strong modes. Basic compression is available without installation, while Moderate and Strong are Pro options. Smallpdf says files are transferred with TLS encryption and deleted from its servers after one hour.

Choose it when: you want a polished interface and a simple default setting. Be aware that the company says usage limits may apply to free use.

3. iLovePDF Compress PDF

iLovePDF offers Extreme, Recommended, and Less Compression choices. The labels make the tradeoff clear: stronger compression produces a smaller file with lower image quality, while lighter compression preserves more quality.

Choose it when: you want to pick a compression level quickly. Because processing is cloud-based, use a local tool instead for documents you do not want to upload.

4. Adobe Acrobat Online

Adobe Acrobat's online compressor accepts PDFs up to 2GB and offers High, Medium, and Low compression levels. Adobe states that files are handled on its servers and deleted unless you sign in to save them.

Choose it when: you have a large PDF or prefer an established PDF workflow. For repeated or advanced optimization, some options may require an account or Acrobat Pro.

5. PDF24 Compress PDF

PDF24 publishes granular settings for DPI, image quality, grayscale conversion, font subsetting, metadata removal, and other structural changes. Its site says the online tool is free without time restrictions and that server files are deleted after one hour.

Choose it when: you want more control than a single low, medium, or high preset. PDF24 also provides a Windows desktop application for offline work.

6. Sejda Compress PDF

Sejda lets you adjust image quality, PPI, grayscale conversion, and font optimization. Its published free service allows three tasks per hour and compression for documents up to 100MB, with files automatically deleted after two hours.

Choose it when: you need precise image settings and your file fits the free limits. Its desktop version is an alternative when files must remain offline.

How Does a PDF Compressor Make Files Smaller?

A PDF compressor can remove redundant objects, optimize embedded fonts, recompress images, lower image resolution, or strip optional metadata. The exact method determines the tradeoff between file size and appearance. PDF24 publishes controls for font subsetting, image quality, DPI, grayscale conversion, and structural cleanup. Smallpdf says its service removes repetitive data and re-encodes large images.

Text-heavy PDFs may already be efficient, so the reduction can be modest. Scans, portfolios, and documents with large photographs usually give a compressor more image data to optimize. No tool can promise the same percentage reduction for every PDF. Compare the final size with the original, then inspect the output instead of judging quality from the percentage alone.

How Should You Compress a Resume PDF?

Use moderate compression and protect text clarity. After downloading the smaller file, open it at 100% zoom, check every page, and confirm that the text is selectable. Avoid converting the resume into page images because selectable text is easier for recruiting software and humans to read.

1. Save an untouched copy of the original PDF.
2. Compress with a privacy model appropriate for the document.
3. Check headings, dates, links, icons, and fine print.
4. Run the result through the resume score checker.
5. Use a clear filename such as Firstname-Lastname-Resume.pdf.

Which PDF Reducer Should You Choose?

Choose EasyResume for a private resume under 5MB, PDF24 or Sejda for manual quality controls, and Adobe for very large files. If a PDF stays too large, remove unnecessary pages before applying stronger compression. Read the step-by-step PDF compression guide, then build your resume with EasyResume.