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110 guides 14 free tools updated 5 September 2026

Smaller images.
Faster pages.

Find the images slowing down your site. Resize or compress them with our tools, then use the guides to choose formats and fix how your pages load them.

ImageGuide is a free image optimization reference published by Sirv. Start with a guide for the method, a tool for your file, or the Benchmark Lab for a measured example.

Get the image auditor Fix an image
Miniature print-shop crew compressing a tall stack of identical photographs into one thin, equally crisp image

Bytes needed for the same visual quality, median of 74 photos

JPEG
baseline
WebP
-7%
AVIF
-31%
JPEG XL
-23%

SSIMULACRA2 score 70 (high quality), reference encoders. See the full benchmark →

Choose a tool

01 Audit a page Check image sizes, loading behavior and missing markup with the Chrome extension. 02 Fix one file Compress or inspect an image. Convert between 6 supported input formats and 5 output formats. 03 Fix a whole folder Use Press to audit and batch-convert folders locally without touching the originals. 04 Automate delivery Use Sirv to resize, compress and deliver images through a CDN.

Latest

All guides
Performance 6 min read The image loads, but canvas export fails: fix image CORS Debug a tainted canvas with a two-origin example: check crossorigin, response headers, redirects and cached images without a public proxy. Performance 7 min read Why a small image upload can use so much memory A 311 KiB PNG decoded to 61 MiB of pixels in our test. Measure the difference and add byte, pixel, format and animation limits to a Sharp upload pipeline. Use Case 7 min read Keep AI-image labels when optimizing product photos for Google Shopping A tested sharp example shows how resizing strips AI-image metadata. Keep the source label and check the file your product feed serves.

Browse by topic

Formats WebP, AVIF, JPEG, PNG, GIF, SVG, HEIC Platforms Shopify and WordPress workflows Social media Sizes, crops and compression per network Industries Real estate, restaurants, fashion, and more

In depth

All 110 guides
Use Case 7 min read
Crop one product photo for a card, a hero and a zoom view

Use one shirt photo to compare a square card, a wide hero, a mobile crop and a zoom source. Includes exact crop coordinates, CSS and responsive picture markup.
Performance 7 min read
Sharp 0.35 changed AVIF encoding: retest your quality settings

We compared Sharp 0.34.5 and 0.35.3 on four identical fixtures. See file sizes, encoding times, downloadable detail crops and a script to reproduce the results.
Format 13 min read
10 Ways to Convert Any Image to JPG on Any Device

Turn any image into a JPG on Windows, macOS, iPhone, Android, Linux, browser or command line - and find out what your file really is.
Format 16 min read
8 Ways to Convert an Image to Vector (JPG and PNG to SVG)

Turn a JPG or PNG into a vector with Inkscape, Illustrator, potrace, VTracer or a manual redraw - and see when tracing is the wrong answer.
Format 14 min read
9 Ways to Convert Images to WebP in Bulk

Convert PNG and JPG to WebP with cwebp, sharp, ImageMagick, libvips or a CDN: which quality matches your JPEG, and when lossless wins.
Comparison 17 min read
9 Ways to Extract Text From an Image (OCR Methods Compared)

Get text out of a photo with your phone, Google Drive, Windows, macOS, Tesseract or a cloud OCR API - plus how to raise accuracy on bad scans.