Compress PDF

Reduce PDF file size for email, upload, or storage by downsampling embedded images. The compression runs in your browser — your document never leaves your device.

Conversions

About Compress PDF

Compress PDF downsamples embedded images and removes redundant data so the file is easier to email or upload while staying readable. You can pick a quality level — higher keeps scans sharper, lower reclaims more bytes. Because the whole pipeline runs locally in your browser, invoices, hospital discharge papers, and other private documents never leave your device the entire time.

Best for

  • Shrinking PDFs that exceed a 25 MB email attachment limit
  • Fitting scanned tax forms inside account portal upload caps
  • Speeding up downloads of large reports served from your site

Pros

  • +Pick a quality level: lighter compression for sharper output, stronger for smaller files
  • +Downsampled embedded images, not just zipped PDF streams
  • +Runs locally — payslips, tax returns, and IDs are never uploaded

Cons

  • −Heavy-graphic or already-compressed PDFs may shrink less than expected
  • −Stronger quality loss makes crisp small print harder to read on zoom

How to use Compress PDF

  1. 1

    Select or upload the source files from your local device storage.

  2. 2

    Specify conversion settings, options, or target output formats.

  3. 3

    Wait for the client-side browser logic to process the files securely.

  4. 4

    Download the finalized outputs directly to your system.

Frequently Asked Questions

How much can I shrink a typical scanned PDF?
Scanned PDFs are mostly embedded page images, so downsampling them typically cuts size by 40–80% at medium quality. PDFs that are mostly crisp vector text shrink far less, since there is little image data to downsample.
Will the compressed PDF still be readable when printed?
At medium or high quality, regular print sizes (A4/Letter at 100%) remain sharp enough for invoices, forms, and reports. For very small print or archival signatures, choose a higher quality level.
Can Compress PDF remove passwords or restrictions?
No. Encrypted PDFs stay encrypted; the tool only reduces file size by downsampling image data. To remove a password you must first open the file and export an unlocked copy.
Can I compress many PDFs in one go?
Yes — drop multiple files in the upload area and each is processed independently. On low-RAM devices, large or very high-resolution scans are best compressed in smaller batches.
Are my private PDFs uploaded when compressing?
Never. Compression runs entirely in your browser via JavaScript, so financial statements, payslips, and signed contracts never leave your device.

Related tools

FREE

100% Free

No hidden fees, no subscriptions, and no limits. Enjoy complete access to all features gratis.

SIGNUP

No Signup Required

Start converting immediately without creating an account or sharing email address.

PRIVACY

Private & Secure

Your files never leave your device. All processing is completed locally for maximum privacy.

BATCH

Batch Conversion

Convert multiple files simultaneously to save time. Fast and efficient multi-file queue.

LOCAL

Runs in Browser

Utilizes advanced client-side WebAssembly technology to process files directly inside your tab.

FORMATS

200+ Formats

Supports a wide variety of formats including images, documents, audio, video, and more.

USER REVIEWS

Compress PDF Quality Rating

4.8
25 reviews

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