Compress PDF
Reduce PDF size in your browser — pick your trade-off between quality and file size. No upload, stays on your device.
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How to compress a PDF
- 1Choose your PDF — drop it or click Choose PDF
- 2Pick a level — Recommended, Smaller file or High quality
- 3Download the result — shrunk locally, no upload
Why Enclodoc
- ✓ Files stay on your device — closed tab clears memory
- ✓ No unnecessary uploads and no server copies
- ✓ Fast browser processing — no queues
- ✓ Works without account for supported free usage
If a file ever needs a server step, we ask first — never silently.
Compress without uploading — how it stays in browser (WASM re-encodes images)
EncloDoc compresses without uploading: we parse the PDF with pdf-lib in your browser, find embedded JPEG/PNG images, and re-encode them at a lower quality via WebAssembly — all in memory. Network = 0 file requests (check DevTools). That is the difference between "compressed in cloud" (PDF24) and compress pdf without uploading. No server ever sees your thesis, contract, or scanned ID.
We never send even a thumbnail. After first load, disconnect and compress again — still works offline because the encoder is cached. Close the tab and the bytes are gone. If privacy mattered, you would not upload a 50 MB board pack to a free cloud just to save 20 MB.
Compress to under 1 MB for Gmail and portals (25 MB cap)
Gmail caps total message at 25 MB; most job and university portals cap at 1–5 MB. If your scanned PDF is 8 MB, you need "compress pdf to 1mb" — not "smallest at any cost". EncloDoc lets you preview size before download: try Keep Text (re-encodes only images, text stays vector-sharp) for scanned docs, or Smallest (more aggressive JPEG pass) for photo-heavy reports.
What stays sharp? Vector text, lines, and fonts — untouched. Only embedded images are shrunk; if your PDF is text-only, saving is small (10–20%). If it is scans/photos, expect 40–70% smaller with no visible blur at normal zoom. Always keep the original if you need print master quality.
| Mode | What it does | Best for |
|---|---|---|
| Keep Text | Re-encodes images only, preserves vector text | Scans with text, invoices |
| Smallest | Aggressive JPEG quality drop + downscale | Photo-heavy decks |
| Cloud (others) | Upload, "deleted after 1 hour" | When you do not care about upload |
What to expect — quality and size trade-offs
On photo-heavy decks, Smallest re-encodes at lower JPEG quality plus optional downscale — expect 50–70% smaller with slight softness at 200% zoom; text edges stay vector-sharp because we do not rasterize text. On text-heavy scans, Keep Text touches only image streams, so save is 15–30% but text stays crisp for printing. Always compare original vs compressed at 100% and keep the master for print. Use merge without uploading before compressing if you bundled files — order matters; merged then compressed stays local the whole chain.