⌘ K
binary search · jpeg · webp · local

Compress an image to target size

Set a target KB budget and the tool binary-searches the encoder quality until the output fits. Pick JPEG or WebP. Everything runs locally.

Compress to Target Size
Original
—
no file
Target
≤ 200 KB
jpeg
Actual
—
—
Iterations
—
binary search
Target KB:
Format:
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 JPEG, PNG, or WebP source.

    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
    photo.jpg
    loaded · decodedcanvas · ready
  2. 02

    Set a target

    Choose a budget in KB. Lower numbers force harder compression.

    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.

    targetoptionslive previewencoderquality
    target · tunable200 KB · live
    budget = 200 * 1024
    options applied · liveencoder · live
  3. 03

    Binary search runs

    Quality is halved between bounds until the output fits in 12 iterations.

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

    searchrenderCanvas 2Dpreviewpx-perfect
    iters · resampled12 · px-perfect
    q = (lo + hi) / 2
    preview · livepx-perfect
  4. 04

    Download

    Save the smallest variant that respects your budget.

    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
    fit-200kb.jpg
    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 toolsImage CompressorJPEG Quality Re-encoderBatch CompressorImage ResizerPNG QuantizerDimension Inspector
Use Cases

When to use this tool

Common workflows it speeds up.

Upload size limits

Hit forum or job-board attachment caps without trial and error. 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

Email attachments

Trim photos to fit provider attachment limits. 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

Asset budgets

Keep hero images under your performance budget. 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

API payloads

Drop image weight before base64-encoding into JSON. 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

Slow networks

Pre-shrink images so mobile users get them fast. 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

CDN savings

Reduce egress bytes for large image catalogs. 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

If even quality 0.05 can't reach your number, the tool ships the smallest result it produced. Downscale first for very tight targets.
Within a few KB after 12 binary-search iterations.
WebP usually beats JPEG by 20–30% at the same visual quality. Pick JPEG only if you need broader legacy support.
No — the file is read, drawn to a canvas, and a brand new blob is produced. The source on disk is untouched.
No. Everything runs locally in your browser — your image never leaves the device.
Suggest a tool

Something missing?

Tell us what you need. We ship the top requests every two weeks.

Sent straight to the maintainers · no account needed
47 in queue·8 shipped this month
Request queued. Thanks!