How to prepare photos, signatures, and PDFs for a form
Before preparing an upload, record the required format, maximum size, dimensions, and document rules. Fix only what needs changing, then verify the downloaded output rather than assuming a successful conversion guarantees acceptance.
Reviewed
Build a requirement checklist
- Read the destination’s current instructions; avoid assuming an old application’s settings still apply.
- Record allowed formats, maximum bytes, width and height, page count, and any file-naming rule.
- For printed photos, record physical dimensions and resolution as well as framing and background requirements.
- Keep the original file in a separate place before making changes.
Choose a tool for the actual problem
| Problem | Useful tool | Check afterward |
|---|---|---|
| Photo over a KB limit | Compress Image or a size preset. | Actual bytes and readable detail. |
| Wrong pixel dimensions | Resize Image. | Width, height, crop, and proportions. |
| HEIC rejected by the form | HEIC to JPG. | Actual JPG format, orientation, and size. |
| Signature does not fit a box | Signature Resizer. | Every handwriting stroke and exact dimensions. |
| Only some PDF pages are needed | Split PDF. | Page count, order, and document features. |
| Several photos must be one PDF | Images to PDF. | Image clarity and page order. |
Check more than the green size indicator
A result can meet the byte limit while having the wrong format or crop. Use the result’s actual size and dimensions, and inspect the preview at a useful scale. Reopen the downloaded file when the document matters.
Signature trimming is a near-white heuristic and can remove faint strokes. Passport resizing does not certify a photo’s official suitability. For existing PDFs, structural rewriting cannot promise a tiny target when scanned images dominate the file.
Keep private files private
FileFit’s current image and PDF operations run in the browser. No account, file upload endpoint, third-party file processing, or document database is used. Website hosting still involves ordinary page requests.
Close the tab to leave the workspace and delete unwanted downloads from shared devices. Do not email sensitive documents when reporting a problem; send the tool name, browser, file type, and reproduction steps using a non-sensitive sample if necessary.
Try the relevant tools
Sources and implementation
Tool behavior is documented in How FileFit works. Examples are instructional, not a promise about every file. Report a correction.