⌘ K
pad · margin · transparent · local

Add padding around images on the fly

Extend the canvas with independent top/right/bottom/left padding and a custom fill color — or leave it transparent. Output is a clean PNG.

Canvas Padder
Source
—
no file
Output
—
—
Padding
40/40/40/40
TRBL
Fill
#ffffff
rgb
Fill:
input · image

image/* · runs locally · nothing uploaded

output · preview
Preview appears here
Quick Start

How it works

Pick an image, tune the options, then download the result. Everything runs in your browser.

  1. 01

    Pick an image

    Drop in a PNG, JPG, or WebP. The original file stays unchanged.

    Files stay in memory as an HTMLImageElement — the original bytes are never uploaded, and EXIF metadata is preserved until you explicitly transform it.

    uploadcanvaslocaldecode
    input · bytesimage · loaded
    file.png
    loaded · decodedcanvas · ready
  2. 02

    Set padding

    Enter pixel padding for each side. The canvas auto-expands to fit.

    Encoder quality is exposed where the format supports it — JPEG and WebP get a 0–1 quality slider; PNG is lossless. Options re-render the canvas immediately.

    paddingoptionslive previewencoderquality
    T R B L · tunable40 40 40 40 · live
    w + 80, h + 80
    options applied · liveencoder · live
  3. 03

    Pick a fill

    Solid color or transparent. Transparent keeps PNG alpha.

    Pixel work runs on the Canvas 2D context — drawImage resamples with the browser’s bilinear filter and getImageData/putImageData back per-pixel passes.

    fillrenderCanvas 2Dpreviewpx-perfect
    fill · resampled#ffffff · px-perfect
    fillRect → #ffffff
    preview · livepx-perfect
  4. 04

    Download PNG

    Save the padded result. Output is always lossless PNG.

    Downloads ship via a hidden anchor with an object URL — no server round-trip, and the file on disk is untouched. The output filename inherits a sensible suffix.

    exportdownloadblobclient-sideobject URL
    ok · blobready · saved
    file-padded.png
    shipped · ready to shipsuccess
Pro tips

Browser-only image work that scales

Convert with quality control

JPEG/WebP let you pick a 0–1 quality. Default 0.92 is a good compromise of size and visible quality.

PNG isn’t free

Use PNG only for transparency or sharp edges. For photos, WebP is smaller at the same perceived quality.

Strip EXIF for privacy

Photo EXIF often contains GPS, camera model, and timestamps. Strip before sharing public uploads.

Watch the colour profile

Convert to sRGB before web export. Wide-gamut images render oversaturated in non-managed browsers.

AVIF when it’s available

AVIF beats WebP on size at the same quality. Detect support via <picture> with fallbacks.

Lazy-load below the fold

Add loading="lazy" on <img>. The browser handles scheduling — no IntersectionObserver needed.

Related toolsFit to DimensionRounded Corner CropperImage ResizerBorder AdderWatermark AdderImage Rotator
Use Cases

When to use this tool

Common workflows it speeds up.

Breathing room

Add margins around screenshots for docs. Decoded into a Canvas 2D context — original bytes never leave the tab, so you can process customer-uploaded photos, internal screenshots, or sensitive diagrams without privacy concerns.

px-perfect

Match canvas spec

Hit required dimensions without resizing. Encoders expose quality 0–1 where the format supports it (JPEG, WebP); PNG and AVIF stay perceptually lossless. Pick 0.85 for web, 0.95 for archival, 0.7 for thumbnails.

quality-tunable

Branded backgrounds

Pad with brand color for social cards. Pair with the EXIF Stripper before sharing user-uploaded photos publicly. Camera serial numbers, GPS coordinates, and timestamps often hide in image metadata and leak more than the picture itself.

format-aware

App icon prep

Bake safe-zone padding into app icons. Output preserves colour profile (sRGB) so it renders consistently across browsers, monitors, and print pipelines. Wide-gamut workflows can opt into Display P3 for modern Apple devices.

EXIF-safe

Quick fix

Faster than a full editor for margins. Re-runs only on option changes, never on window resize, so the canvas stays responsive on large images. drawImage uses the browser's bilinear filter for fast resampling.

client-side

Watermark space

Make room for a watermark or signature. Downloads as .png, .jpg, .webp, or .avif with the correct MIME so editors apply native handling on save. The filename inherits a sensible suffix derived from the input.

compression-ready
FAQ

Frequently asked questions

No — JPEG flattens transparency to black. Choose PNG output for transparent padding.
No — use the Aspect Ratio Cropper to remove pixels instead.
No. The original pixels are drawn unchanged at the (left, top) offset.
No. The padding runs locally in your browser — your image never leaves the device.
PNG keeps lossless quality and supports transparency. Convert downstream if you need another format.
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