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Only JPG

The modern, private way to convert any image--PNG, AVIF, HEIC, PDF,
SVG, TIFF, TGA & more--into a smaller, universally compatible JPG.

Drop any image - get a tiny, standard JPG.
100% private. All processing stays in your browser.
Click here to select files or drag & drop.

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Download All as ZIP Auto

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What OnlyJPG Does

OnlyJPG converts many image and document formats into standard JPEGs
in your browser. Nothing uploads to a server. You get broadly
compatible JPG files that open in almost any app and device.

Quality and size controls are built in. We use Google's Jpegli
encoder with sensible defaults. You can adjust quality, chroma
subsampling, progressive mode, color model (XYB or YCbCr), and choose
what metadata to keep.

Private by design. Compression and rasterization happen on your
device. Usage stats are optional and anonymous.

Today's Impact

...
Images processed
...
Bandwidth saved
...
CO2e reduction

How We Estimate Carbon

Smaller files mean every future download uses less energy. We
estimate potential reduction using the Sustainable Web Design model:
data-transfer energy x grid carbon intensity.

  * Energy intensity (SWDM v3): 0.81 kWh per GB transferred.
  * Global default grid intensity: 442 g CO2e per kWh.

This reflects data-transfer only and excludes the one-time CPU cost
to compress on your device.

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Your Privacy & Our Stats

Your images stay on your device. All compression happens locally in
your browser. We don't upload or store files.

To show impact, we collect anonymous counts (image totals, bandwidth
saved). To prevent spam, IPs are used for short-lived rate-limits and
are never stored with stats.

You're in control. Opt out right here--or use the settings panel (gear
above) any time:

Allow Anonymous Statistics

Estimated Downstream Savings

The stats above show direct savings from avoiding uploads and
downloads. This panel estimates the additional, collective impact of
sharing smaller files. We assume 10% of images are shared and each is
downloaded an extra 3 times.

Today All-time
Bandwidth estimate ...
Images considered (today) ...
CO2e estimate ...

Thanks Everyone!

OnlyJPG is built on the shoulders of giants. We're grateful to the
open-source community and service providers who make this tool
possible.

Jpegli
    The core high-fidelity JPEG encoding library from Google that
    powers the app's compression engine.
Emscripten
    The compiler toolchain used to compile Jpegli's C++ codebase into
    high-performance WebAssembly.
PDF.js
    Enables client-side rasterization of PDF files into images for
    processing.
@resvg/resvg-wasm
    A high-performance WebAssembly port of the resvg library, used
    for accurately rasterizing SVG images.
libheif-js
    A WebAssembly library that enables the browser to decode HEIC/
    HEIF images.
geotiff.js
    A robust library for parsing TIFF files, used as a primary
    decoder for multi-page TIFF images.
UTIF.js
    A compact and fast JavaScript library for decoding various types
    of TIFF images, used as a reliable fallback.
@jsquash/avif
    Part of the jSquash project, providing a fast, WebAssembly-based
    decoder for AVIF images.
Three.js
    The 3D library used to render the interactive globe in our
    statistics header.
Material Web
    Provides the high-quality, themeable user interface components
    like sliders, switches, and cards.
fflate
    An extremely fast, lightweight JavaScript library for creating
    ZIP archives for downloads.
ExifReader
    A JavaScript library used to parse EXIF, ICC, and XMP metadata
    from source images.
es-module-shims
    A polyfill that provides support for JavaScript import maps in
    all modern browsers, simplifying module loading.
Bun
    The fast JavaScript runtime powering our anonymous statistics
    backend.
SQLite
    The embedded database used by our statistics server for fast,
    reliable data storage.
Nginx
    The high-performance web server that serves our static
    application and API proxy.
Cloudflare
    Provides the edge cache, proxy, and security services for the
    application and its stats API.
jsDelivr, UNPKG, & esm.sh
    The trio of CDNs used for resilient, multi-region delivery of our
    third-party modules and decoders.
Google Fonts
    The service used to deliver the Atkinson Hyperlegible and Roboto
    typefaces.
Solar System Scope
    Provides the high-resolution Earth textures for the globe
    visualization, licensed under CC BY 4.0.
Live Cloud Maps
    The source for the cloud and specular map overlays, derived from
    EUMETSAT data and available under CC0.

Terms of Service

OnlyJPG is a free tool provided "as-is," without warranties. Always
keep backups of your originals.

Use it for good. Don't use it for illegal, malicious, or abusive
purposes.

We aren't liable for issues, data loss, or existential crises arising
from its use.

Write Us!

Because we don't know what we don't know!

hello [at] onlyjpg [dot] com

Quality

Controls the visual quality of the output JPEG. Higher values result
in better quality and larger file sizes. Jpegli's perceptual model
means that a quality of 90 is often visually identical to the
original, but much smaller.

warning

Chroma Subsampling

Reduce color detail (while keeping brightness sharp) to shrink files.
This works because human eyes are less sensitive to color shifts than
to brightness changes. Learn more /

4:2:0 (Photos)
Reduces color resolution by 75% (best general savings for photos).
4:4:4 (Graphics/Text)
Preserves full color resolution (prevents color bleed on sharp
edges).
4:2:2
Reduces horizontal color resolution only.
warning

Color Encoding

Choose the color model used during compression. The output is always
a standard, compatible JPEG. XYB (perceptual) /, from the JPEG XL
project, often gives smaller files for the same visual quality. YCbCr
(legacy) / matches classic JPEG math for maximum compatibility in
strict, older workflows.

XYB (Perceptual) -- Recommended Legacy YCbCr
warning

Progressive Mode

Progressive JPEG shows a quick full-image preview that sharpens as it
downloads, which feels faster on slow networks.
Sequential loads from top to bottom and can decode slightly faster on
older devices. Learn more /

On (More Scans)
Default. More scans can improve perceived loading.
On (Normal)
Fewer progressive stages.
Off (Sequential)
Standard top-to-bottom decoding.
warning

Adaptive Quantization

Smarter compression that spends more data (bits) on detailed, complex
areas of the image and less on smooth, simple areas. This generally
improves visual quality at a given file size. Highly recommended.

Enable Adaptive Quantization

Transparency & Background

JPEG files cannot be transparent. When converting an image with
transparent areas (like a PNG or SVG), we'll fill those areas with
your chosen background ("matte") color. Learn more /

Matte / Background Color [#ffffff             ]

Grayscale

Remove color entirely to greatly reduce size (great for scans, B&W
photos, line art).

Convert to Grayscale
warning

Metadata

Choose which metadata to keep from the original file. Turning these
off saves space and improves privacy.

Preserve All Metadata
Note: EXIF orientation is always applied to the image pixels to
prevent rotation issues, then stripped. Not all source formats (like
PDF or SVG) contain all types of metadata.
Preserve ICC Profile
Keeps color space definitions for accurate rendering. Stripped in
Grayscale mode.
Preserve EXIF
Camera settings, location, etc.
Preserve XMP
Copyright, keywords, etc.
Preserve DPI
Retain print density.

Download

When finished, automatically start a ZIP download.

Auto-Download when finished

Rasterization Defaults

Default settings for converting vector or document formats into
pixels (a process called rasterization).

DPI (PDF/TIFF/SVG) 150
Higher DPI creates more pixels when rasterizing PDFs/TIFFs/SVGs,
resulting in larger pixel dimensions and a larger file. 150 DPI is
great for screens; use ~300 DPI for print. What is DPI? /

PDF & TIFF (multi-page)

Configure how documents with multiple pages, like PDFs and some
TIFFs, are converted.

First N pages
remove add
All pages

How to export multiple pages:

Per-page (recommended) Single long image
warning Only applies when "Single long image" is selected.
If too large: Smart-slice If too large: Auto-scale DPI
Normalize page widths
Gap between pages (px)

SVG rasterization

Control the output pixel dimensions when converting SVG images.

Longest side target (px) 2048
Used only when Width and Height are both 0. We scale so the longer
side matches this value.
Non-zero Width/Height override "Longest side". If one is 0, we
compute it using the SVG's aspect ratio.

Privacy

Contribute anonymous usage statistics to help improve the service. No
images or personal data are ever sent.

Allow Anonymous Statistics

Reset

If you get lost, reset back to safe defaults.

Reset All Settings to Defaults
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