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hex · bytes · magic · local

Inspect any image as a hex dump

Read magic bytes, see chunk markers, and confirm what a file actually is. Up to 4 KB by default, or the whole file for small images. Runs locally.

Image Hex Viewer
File
—
no file
MIME
unknown
magic bytes
Showing
—
—
Mode
head
head only
input · image

image/*,*/* · runs locally · nothing uploaded

output · preview
Hex dump 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 any file

    Accepts images, but really any binary. Useful for checking the first 16 bytes.

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

    inputuploadcanvaslocaldecode
    input · bytesbinary · loaded
    load: bytes
    loaded · decodedcanvas · ready
  2. 02

    Sniff magic

    PNG starts with 89 50 4E 47, JPEG with FF D8 FF, WebP with 52 49 46 46… the dump shows it.

    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.

    magicoptionslive previewencoderquality
    mime · tunable? · live
    first bytes → mime
    options applied · liveencoder · live
  3. 03

    Read the hex grid

    16 bytes per row with the ASCII gutter on the right.

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

    gridrenderCanvas 2Dpreviewpx-perfect
    row · resampled16 B · px-perfect
    00000000  89 50 4e 47 …
    preview · livepx-perfect
  4. 04

    Copy the dump

    Click Copy to send the visible dump to your clipboard for sharing in a bug report.

    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.

    copydownloadblobclient-sideobject URL
    ok · blobready · saved
    clipboard ← dump
    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 toolsPNG ChunksEXIF ViewerStego DecoderELADimensionsHash Compare
Use Cases

When to use this tool

Common workflows it speeds up.

Verify file types

Catch lies in file extensions during uploads. 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

PNG chunk hunt

Find IDAT, tEXt, gAMA, sBIT chunks by name in ASCII. 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

JPEG marker scan

Locate SOI, APP1 (EXIF), DQT, and SOS markers. 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

Custom format debug

Inspect proprietary or generated binary headers. 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

Forensics

Spot hidden text or appended payloads after IEND. 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

Steganography

Pair with the stego decoder to inspect the carrier. 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

Most format identification happens in the header. Showing the entire file for a large image would freeze the page.
Files over 256 KB are too large to render as hex in one go. Use a dedicated hex editor for those.
Printable bytes appear as letters. Look for chunk names (IHDR, IDAT, IEND) or strings like 'Adobe', 'Exif'.
No — this is a read-only viewer. Use a hex editor like HxD or 010 to write.
No. Everything runs locally in your browser.
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