What does the sepia filter do?

It applies the classic sepia matrix to each pixel, producing the warm reddish-brown tone of old photographs. The intensity slider blends between the original colours and full sepia.

Can I make the effect subtle?

Yes. Lower the intensity slider to blend the sepia tone with the original photo for a gentler, partially-toned look.

What is the sepia matrix used?

The standard sepia matrix is sr = 0.393R + 0.769G + 0.189B, sg = 0.349R + 0.686G + 0.168B, sb = 0.272R + 0.534G + 0.131B, each capped at 255. This is the widely used formula that gives the classic warm brown tone.

How does the intensity slider work?

Intensity sets a blend factor t from 0 to 1 (0-100%). Each channel becomes original + (sepia − original) × t, so at 0% you see the original photo and at 100% you see full sepia, with smooth steps in between.

Does sepia keep transparency?

Yes. Only the colour channels are toned; the alpha channel is preserved, so transparent PNG areas remain transparent in the output.

Does this upload my photo?

No. The sepia transform runs in your browser via the canvas API, so the image never leaves your device.

What is the Sepia Photo Filter?

Free sepia tone image filter. Add a warm, vintage sepia effect to any photo with an adjustable intensity slider. Runs entirely in your browser — nothing is uploaded. It runs free in your browser on Gera Tools, with nothing uploaded.

Sepia Photo Filter — Gera Tools

Name: Sepia Photo Filter
Creator: Gera Tools
License: https://creativecommons.org/licenses/by/4.0/

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Sepia tone photo filter

Add a warm, vintage sepia tone to any photo for that classic old-photograph look. An adjustable intensity slider lets you blend between the original colours and a full sepia effect — from a subtle warm wash at 20% to the rich monochrome brown of a Victorian print at 100%.

The sepia matrix explained

Historical sepia prints had a characteristic reddish-brown tone because silver in old photographic paper was replaced by silver sulfide over time, shifting image colours toward warm browns. The digital equivalent mimics this by mixing the RGB channels according to a standard weighting matrix:

sepia_R = 0.393 × R + 0.769 × G + 0.189 × B   (capped at 255)
sepia_G = 0.349 × R + 0.686 × G + 0.168 × B   (capped at 255)
sepia_B = 0.272 × R + 0.534 × G + 0.131 × B   (capped at 255)

Notice that green contributes heavily to all three output channels (0.769, 0.686, 0.534), while blue contributes the least — this is what produces the warm, amber quality. The matrix values were established by the W3C and are the widely accepted standard for digital sepia filters.

The intensity slider blends between the original pixel and the sepia result: output = original + (sepia − original) × intensity. At 0% you see the original; at 100% you see pure sepia; intermediate values create the toned look.

Pixel-level example

For a mid-brown pixel at R=120, G=80, B=60 at full sepia intensity:

Channel	Calculation	Result
R	0.393×120 + 0.769×80 + 0.189×60	≈ 120
G	0.349×120 + 0.686×80 + 0.168×60	≈ 107
B	0.272×120 + 0.534×80 + 0.131×60	≈ 83

The result (120, 107, 83) is a warm amber-brown — the signature colour of sepia.

Practical uses and intensity guide

20–35% intensity: subtle warm tint, good for social media portraits where you want a period feel without going full monochrome.
50–70% intensity: noticeably sepia, still some colour visible — works well for travel or nature shots that you want to feel timeless.
90–100% intensity: full vintage effect; the image reads as near-monochrome with a distinctly warm brown tone — classic for family archive scans.

All processing runs in your browser using the Canvas API. Your image is never uploaded and nothing is stored on any server.