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Signature & Stamp Background Remover

Photograph a signature written on paper and get a transparent PNG back — ready to drop straight onto a contract or form.

Drop a photo of a signature or stamp here, or click to choose

JPG · PNG · WebP (HEIC opens in Safari only) · white paper in good light gives the cleanest result

Choose file

Threshold 12 Ink colour Keep original colour

Remove specks 25 Padding px

If the result is not clean

Strokes are breaking up — lower the threshold. The lower it goes, the fainter the strokes it keeps.
Paper marks are coming through — raise the threshold, or raise "Remove specks".
The stamp is not picked up — switch to "Stamp / seal". Red ink cannot be separated by brightness; it has to be separated by colour.
Text next to the stamp comes along — stamp mode drops black text on its own. If any remains, raise the red range.

0 B uploaded — this page has not sent your files to any server?

Private by design — your photo is never uploaded anywhere. The background removal happens entirely inside your browser and the transparent PNG is saved straight to your device. It even works offline.How this differs from upload-based sites — most converter sites upload your photo to a server, process it there, and promise to delete it after a while. Until that happens, your photo is sitting on someone else's server. imgmoa has no upload step at all. The more sensitive the photo — a scanned ID, a photographed contract, pictures of your kids — the more that difference matters.

Put a paper signature on a document without the gray paper around it

Paste a photo of your signature onto a document and a gray rectangle of paper comes along with it. This tool turns the paper transparent and keeps only the ink as a PNG, so wherever you place it on a PDF or document, only the signature shows. Red seal ink has its own mode that separates it by hue.

A closer look

Paper in a photo is almost never evenly lit, so a single brightness cutoff either keeps a shadowed patch of paper as ink or loses faint strokes. In “Signature / writing” mode each pixel is compared with the average brightness of the area around it, and only spots darker than their surroundings by at least the Threshold value count as ink. Edges fade to transparent gradually instead of breaking into jagged steps. By default the ink is painted in the “Ink colour” (near-black to start with); tick “Keep original colour” to keep, say, a blue pen blue. Photos are scaled to at most 2,000 pixels on the long side for processing, and the result is trimmed to the inked area plus the Padding you set.

Red seal ink is about as bright as black writing, so brightness alone cannot separate them. “Stamp / seal” mode selects only pixels whose hue falls in the red band and whose saturation is high enough. Raising “Red range” keeps only stronger red; lowering it picks up a faint impression. Where the ink only half covered the paper, the pixel is made partly transparent and its original shade is recovered, so no white fringe appears. “Trim to a circle” cuts away everything outside a circle fitted to the seal, and “Remove specks” erases isolated dots below a certain size. Every slider redraws the result immediately.

How to use it

Photograph the signature or stamp on white paper, from straight above in good light, and add that single photo.
Choose Signature / writing or Stamp / seal.
Adjust while watching the result: Threshold and Ink colour for signatures, Red range and Trim to a circle for stamps, and Remove specks and Padding (0–200 px) for both.
Press Save transparent PNG. The file downloads with “_transparent” added to its name.

When it helps

Signing a PDF contractInstead of printing and scanning, make a signature PNG once and place it on agreements and consent forms with a PDF signing tool.

A company seal for quotes and invoicesLift the company stamp in stamp mode and drop it into your document templates so you never have to stamp and scan again.

Keeping a blue-ink signatureTick “Keep original colour” to produce a signature image that stays the blue of the pen you used.

Hand-lettered logosTurn a phrase or logo written by hand on paper into a transparent PNG to use on cards, posters and slides.

Common snags

It says “Nothing was kept”.The threshold is set so high that nothing qualifies as ink. Lower it and the faintest strokes come back first. Very light writing such as pencil works better if you go over it in pen.

A blue or black stamp is not picked up in stamp mode.Stamp mode selects red seal ink only. Process stamps of other colors in Signature / writing mode and tick “Keep original colour” to keep their color.

Paper stains or dots come through.Raise the threshold a little or raise Remove specks. A photo with a shadow falling across the signature is hard to clean at any setting; retaking it without the shadow is the quickest fix.

It says it could not read the image.Formats such as HEIC only open if your browser can decode them itself. Convert with HEIC to JPG first, or use a photo saved as JPG or PNG.

Tip Get close enough that the signature fills the frame; within the 2,000-pixel processing limit, the strokes then keep more pixels and stay smooth when enlarged.

Signature cutout FAQ

How should I take the photo?

Write firmly with a black pen on white paper, then shoot straight down in bright light with no shadow across the page. Yellowed paper and uneven lighting are handled well, because each pixel is compared with the brightness around it rather than a fixed value.

Why is there a separate stamp mode?

Red seal ink is about as bright as black text, so brightness alone cannot tell them apart. Stamp mode separates by colour instead, which keeps black text out and lifts only the seal. Turn on "Trim to a circle" to cut away anything outside the seal border.

What can I do with the result?

It is a transparent PNG, so you can place it in a PDF editor or word processor and only the signature appears — no white rectangle around it.

Could my signature leak?

No. The photo is never uploaded; everything runs inside your browser. That matters more here than almost anywhere else, since a signature or a company seal is exactly the kind of thing you do not want sitting on someone else's server. It works with the network off.

Why sliders instead of doing it all automatically?

This is a deterministic calculation, not a guess, so the knobs that matter can be exposed. When the result is not right you move one slider and see the fix immediately, instead of retrying and hoping.