Get a document ready to fax: fax-spec conversion and a cover sheet

This tool does not send faxes. It gets your document ready: fax-spec black and white, plus a cover sheet.

Your file is never uploaded. Everything runs inside this browser. No account, no queue.

Convert to fax spec

Choose filesPick photos or PDFs, or drop them here. You can select several at once.

Fax resolutionFine 204 x 196 dpiThe fine mode fax machines use. Each page becomes 1728 pixels wide and 2292 lines tall. Use this for text documents.Square 200 x 200 dpiSquare 200 dpi. Each page becomes 1728 pixels wide and 2339 lines tall. A safe choice when the other side receives files rather than paper.

How to go black and whiteThresholdAnything darker than the cutoff turns black. Sharpest for text.DitheringScatters dots to keep shading. Use it when the page contains a photo.

Threshold 140Lower it and faint writing disappears. Raise it and paper stains turn black. Default is 140.Contrast 0Raise it to rescue light pencil writing. Default is 0.Margin 6mmKeeps the edges clear. Fax machines often clip the outer edge, so the default is 6 mm.

Make a fax cover sheet

Fill in who it goes to and we build one cover page. The page count is counted from your files.

Add a cover sheet as page one

ToFax numberFromSender contactSubjectNotes

The page count will read 1. Add more files and it recounts.

The cover sheet carries no branding of ours.

Before compression a page is 483.5KB. A dense page ends up larger than a sparse one.

What this tool does not do

It does not send the fax. There is no phone line behind this page. Take the file it makes and upload it to a fax service or app.

It does not confirm delivery. Ask the fax service, then call the recipient.

It does not look up fax numbers. Get the number from the office itself, by phone or from their site.

It does not auto straighten a tilted photo. Auto rotation cuts off text more often than it helps, so it only adjusts margins and contrast.

How faxing works Compare fax services

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Same maker, same rule: your file stays in your browser.