Fill a PDF form (scanned ones too)
When you get a PDF to fill in, it’s one of two kinds: one with interactive form fields you can click into and type, and one that’s scanned or flat with no fillable fields at all — and that second kind is the maddening one most tools simply can’t handle. Fill PDF Form does both: if it detects interactive fields, it lists them for you to fill and flattens them on export; if it’s a scan or flat table, it lets you click-to-place text, ✓ and ✗ wherever they belong. Chinese and any Unicode fill in fine (rendered locally). It all runs in your browser, with the form never uploaded.
When you get a PDF to fill in, it’s one of two kinds: one with interactive form fields you can click into and type, and one that’s scanned or flat with no fillable fields at all — and that second kind is the maddening one most tools simply can’t handle.
How to fill pdf form
- 1Select the PDF form you want to fill.
- 2If interactive fields are detected: type, check or choose a value for each listed field.
- 3If it’s a scan / flat table: pick “Type text / Mark ✓ / Mark ✗” and click the spot on the page to place it.
- 4Click “Fill & download” to export the completed PDF.
Why use compress cat's Fill PDF Form?
- Scanned forms work too: other tools only recognize interactive fields and stall on a scanned or flat form; here, click-to-place lets you fill it anyway.
- Interactive forms get flattened: when real fields are detected, values are filled and flattened on export so every reader and printer shows them identically, with no misalignment between apps.
- Unicode-friendly, and nothing leaves your device: filled text is rendered locally so any script stays crisp, and the whole form is processed in your browser — sensitive details never hit a server.
Frequently asked questions
Yes. A scan has no interactive fields, so the tool automatically switches to click-to-place mode: pick Type text / Mark ✓ / Mark ✗ and click where each goes on the page — exactly the part most tools can’t do.
No. Text you fill in is rasterized locally via the browser canvas and layered onto the page, so Chinese and any Unicode display correctly without relying on the PDF’s embedded fonts.
Because export flattens them — locking your values into the page content so any reader or printer shows them identically and nothing gets dropped. The trade-off is the fields can’t be edited afterward; to change them, refill from the original file.
No. Field detection, filling, click-to-place and export all happen locally in your browser — the file is never uploaded, which matters for sign-up and application forms that carry personal information.
Turn it into an automated flow
Need to batch-process, or chain several steps? Use the workflow builder to combine compress, merge, rotate and watermark into a reusable pipeline.
Updated · compress cat team