Free Online Tool

Compress PDF to 250 KB

Targets a 250 KB output. Fine-tune the settings in the tool below if needed.

100% Private

Lightning Fast

No Sign-up

Why Use Our PDF Compressor?

Built for speed, privacy, and quality — everything you need, nothing you don't.

Lightning Fast

Uses advanced browser technology for near-native compression speed directly on your device.

100% Private

Your PDF never leaves your device. All compression happens locally — nothing is uploaded to any server.

Two Compression Modes

Choose By Quality to preserve text and shrink images, or By Size to target an exact file size.

Free Forever

No account required, no watermarks, no ads on your output. Completely free to use.

How to Compress a PDF

Three simple steps to a smaller PDF file.

Upload Your PDF

Drag and drop your PDF onto the tool area or click to browse. No sign-up required.

Choose Compression Mode

Select By Quality to shrink embedded images while keeping text intact, or By Size to set an exact target file size in KB or MB.

Download Compressed PDF

Click Compress PDF and download your smaller PDF instantly. The original file is never modified.

Who Uses PDF Compression?

From students to enterprise teams, everyone benefits from smaller PDF files.

Email Attachments

Shrink large PDFs to fit under email attachment size limits without re-creating the document.

Web Publishing

Optimize PDFs for fast website loading times and better user experience.

Cloud Storage

Reduce PDF sizes before uploading to Google Drive, Dropbox, or OneDrive to save storage space.

Archiving

Compress old document archives to free up disk or backup storage.

Frequently Asked Questions

Everything you need to know about our PDF compressor.

Our tool uses advanced browser-based processing libraries that run entirely in your browser — nothing is sent to any server. For 'By Quality' mode, it scans internal image streams in the PDF and re-encodes them at a lower quality. For 'By Size' mode, it renders each page to an image and recompresses them to hit the target file size.

'By Quality' keeps the text, fonts, and vector content in your PDF intact — it only compresses embedded images. This is ideal for most documents. 'By Size' flattens the entire PDF into images to hit a specific KB or MB target, which means text will no longer be selectable but achieves much more aggressive compression.

If you use 'By Quality' mode, yes — all text, fonts, and vector graphics are fully preserved. In 'By Size' mode, each page is rendered as an image, so text will appear but cannot be selected or copied.

Since all processing happens in your browser, the only practical limit is your device's available memory. Most devices handle PDFs up to 50–100 MB without issues.

Absolutely. Your file is processed entirely on your device using client-side WebAssembly. No data is ever sent to a server. When you close the browser tab, all processed data is cleared from memory.

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PDF Compression: Complete Guide

PDF files can grow large due to embedded high-resolution images, fonts, and metadata. Our free online PDF compressor uses WebAssembly to process your file directly in the browser — no uploads, no privacy risks.

By Quality vs By Size

The By Quality mode scans all embedded image streams in the PDF and re-encodes them at the quality percentage you choose. Text, fonts, hyperlinks, and vector graphics remain fully intact. This is the recommended mode for most documents.

The By Size mode renders every page of the PDF to a canvas image and recompresses each image to fit within your target KB or MB budget. This achieves more aggressive compression but converts the entire document to a flat image — text will not be selectable.

Tips for Best Results

For documents with lots of text and few images, By Quality at 60–70% gives the best results.
For scanned documents (where pages are already images), By Size is more effective.
If your PDF is already small, compression gains may be minimal.