Single-page forms · signature pages
Compress a PDF to 100 KB.
100 KB is the cap for the smallest PDF uploads: one-page forms, signature declarations, DSC application attachments. One greyscale A4 at 100–150 DPI fits — almost nothing multi-page does.
- 100% client-side
- Nothing is uploaded
- No account
- Canvas / WebAssembly on your device
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What fits in a 100 KB PDF
| Document | Fits 100 KB? |
|---|---|
| One A4 page, greyscale, 100–150 DPI | Yes — the intended use case |
| One A4 page, text-born, rasterized at 150 DPI | Yes, easily |
| One A4 page, colour scan | Usually not — 150–300 KB |
| Two or more pages | No — split, or use the 200/300 KB pages |
Expert trap: multi-page hope
Bytes scale with page count. If your document is three pages, no setting makes it 100 KB and stay readable. Split the pages and upload separately where the portal allows, or move up to the 200 KB or 300 KB preset.
Greyscale is the 100 KB superpower
Colour seals rarely matter to a validator; greyscale cuts the byte count three to four times while keeping every glyph. Try greyscale before touching DPI.
Frequently asked questions
Can a colour scan fit 100 KB?
One page at about 100 DPI sometimes — but expect soft text. Greyscale at 150 DPI reads better at the same bytes.
Does compression destroy form fields?
Yes: fills, checkboxes and layers flatten during rasterization. Fill and flatten the form first, then compress the result.
Can I compress a digitally signed PDF to 100 KB?
No. Any re-encode invalidates the signature's byte seal. Compress the unsigned original, then sign the compressed file.
100 KB PDF or 100 KB JPG — which is sharper?
For a single page where the portal accepts images, JPG keeps more sharpness per byte. PDF wins when the upload field requires PDF or page structure matters.
Will text stay selectable after compression?
Rasterized pages become images, so selectable text is traded for size. At 100 KB that trade is usually the only way in.