The most aggressive preset. Good for legacy government and exam portals that enforce a strict 50 KB cap on uploads. We try every quality tier in descending order and report the smallest version that fits — or, if nothing fits, the tightest attempt so you can judge for yourself. No upload, no account.
Before you drop the file, make sure the portal really requires 50 KB and not 100 KB.
50 KB is a hard cap on a narrow set of legacy systems — older Indian state government job portals, a handful of SSC and UPSC upload fields, Pakistani FBR tax forms, and some older university admission e-forms. If the cap is 50 KB, it is usually because the portal stores uploads in a fixed-size database column that was sized back when bandwidth was expensive. Modern portals have moved to 100 KB or 200 KB.
Check the portal's help text carefully. If it says 50 KB "recommended" but does not reject at 60 KB, save yourself a tier of quality loss and target 100 KB instead.
Every byte of compression happens locally with pdf.js and pdf-lib. No network calls, no server, no cloud. Bank statements, medical PDFs, and exam documents stay on your device.
Output is clean. We do not stamp the PDF or gate the download.
We try high quality first and drop to more aggressive tiers only if the file does not fit. You never get crushed results when a gentler tier would have worked.
If 50 KB is impossible for your PDF, we tell you what the smallest achievable size is. No silent cropping of pages.
Expected output per tier. Your PDF may differ — photos compress worse, plain text compresses better.
| High (tier 0) | 2.0 × 0.8 — ~900 KB. Way above 50 KB. |
|---|---|
| Medium (tier 1) | 1.5 × 0.6 — ~420 KB. |
| Low (tier 2) | 1.0 × 0.4 — ~180 KB. |
| Very low (tier 3) | 0.75 × 0.3 — ~95 KB. |
| Extreme (tier 4) | 0.5 × 0.25 — ~55 KB. Near 50 KB — 1–2 page PDFs usually fit here. |
| Last-resort (tier 5) | 0.4 × 0.18 — ~35 KB. Ugly but under 50 KB for almost anything text-only. |
Target is already set to 50 KB. Drop your PDF.
Compress to 50 KB
Private, free, no upload.
For a text-only 1–2 page PDF: yes, usually. Every page adds roughly 8–25 KB at the most aggressive tier, so a 3-page text PDF can just fit under 50 KB. For anything with photos or scanned content, 50 KB means visible artifacts — acceptable for screen viewing, not for printing. If the tool cannot fit, it shows the smallest version it produced and you decide.
Mostly legacy e-forms: older Indian state government job applications, some SSC and UPSC uploads for supporting documents, a handful of university admission forms in South Asia, and older Pakistani FBR tax attachments. The cap exists because these systems store uploads in database BLOB columns with a fixed size. Many portals listed as 50 KB actually accept up to 100 KB in practice — check the help page before compressing.
At the most aggressive tier each page is rendered at half resolution and re-encoded with heavy JPEG compression. At 100% zoom it still reads cleanly. Zoom to 200% and you will see blocks around letter edges. This is a fundamental trade-off of target-size compression — 50 KB simply cannot hold more information.
No. Target-size compression re-renders each page as a JPEG image, which loses the text layer. The output is visually identical to a scan. If searchability matters, target a larger size (500 KB or 1 MB) so the original vectors are preserved, or OCR the compressed file afterward.
No. Compression happens entirely in your browser. You can verify with the network tab. Close the tab and nothing remains.
Compress to 100 KB
Common e-form cap
Compress to 200 KB
For DS-160 supporting docs
Compress to 300 KB
Passport Seva & exam portals
Compress to 1 MB
Email attachment friendly
Compress PDF on Mac
Preview vs browser tool
Compress PDF on iPhone
Safari · no App Store
Compress PDF on Windows
No Acrobat needed
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