Practical guide 3 min read
What DPI means, and how to get a 300 DPI image
Why DPI changes print size and not quality, how large your photo can print, and how to set 300 DPI without re-compressing it.
New
Tool
Free Image Tools
12 free image tools that run in your browser: convert HEIC, WebP and PNG, compress, resize, crop and remove photo metadata without uploading anything.
All 12 image tools
Convert
Compress & resize
Crop, rotate & flip
Photo details & web
- Remove EXIF Data Strip the location, camera and date from photos.
- EXIF Viewer See a photo’s hidden date, camera and location details.
- Favicon Generator Make favicon.ico and app icons from any image.
- PNG to ICO Convert PNG images to Windows .ico icons.
- Image to Base64 Encode an image as a Base64 data URI for HTML and CSS.
Working with PDFs? Put photos into one with JPG to PDF, which takes iPhone HEIC photos too, turn pages into pictures with PDF to JPG, or see all the PDF tools.
Questions
Are my images uploaded?
No. Every tool runs in your web browser, so your images are read, changed and saved on your own device and never sent to LabAnvil or anyone else. Once the page has loaded, the tools even work offline.
Is it free? Do I need an account?
Free, with no watermark, no daily limit, no account and no cap on file size beyond what your device's memory can handle.
Which image formats are supported?
JPG, PNG, WebP, HEIC and HEIF, AVIF, GIF, BMP, ICO, SVG and Photoshop PSD can all be opened, and JPG, PNG, WebP and ICO can be created. TIFF opens in Safari, the only browser that reads it.
Which devices does it work on?
Any up-to-date browser: Chrome, Edge, Firefox or Safari on Windows, Mac, Linux, Android, iPhone and iPad. Big batches of large photos are quicker on a computer than on a phone.
What does a LabAnvil account add?
Only convenience: your favourite and recently used tools follow you across devices. Every tool works the same without one.
Can I work on many images at once?
Yes. Most tools take as many images as you like and download them together as a ZIP. Crop, the EXIF Viewer, the Favicon Generator and Image to Base64 work on one image at a time.
About
Everything you usually need to do with an image, in one place: convert iPhone HEIC photos, WebP and AVIF images to JPG or PNG, compress photos by quality or to an exact size in KB, resize and crop them, rotate and flip them, change their DPI, see and remove the location hidden in them, and make favicons and icons.
Nothing is uploaded. Your browser does all the work, so private photos stay on your device, big batches don’t wait on a server, and there’s no watermark or daily limit.
How it works
- HEIC photos are decoded with libheif, compiled to WebAssembly and run in a background worker, so even browsers that can’t read HEIC convert them without freezing the page.
- Photo details are handled with care. Converting keeps the date and camera by default and leaves out the location unless you ask. Serial numbers, maker notes and thumbnails are never copied.
- Lossless where it can be. JFIF to JPG, Remove EXIF Data and Change Image DPI edit the file around the picture without re-compressing it, and colour profiles are kept.
- Compression that never makes things worse. JPG and WebP are re-encoded at the quality you pick, PNGs are reduced to a palette of up to 256 colours with dithering, and if a result isn’t smaller than the original, you get the original back.
- Sharp resizing. Big reductions happen in halving steps, and SVGs are redrawn at the exact size you ask for rather than scaled.
Notes
Everything runs in your browser, so very large images are limited by your device’s memory: phones and tablets handle up to about 16 megapixels per image, computers far more. TIFF files open in Safari only. Some browsers can read WebP but can’t create it; Chrome, Edge and Firefox can do both.
A little guidance
Get more from your tools
Practical guide 3 min read
How to remove the location from a photo before sharing it
Check whether a photo gives away where it was taken, then strip the location or all hidden details without changing how the picture looks.
Practical guide 3 min read
How to convert HEIC photos to JPG
Make a JPG copy of your photos, choose quality and metadata settings, and understand why the result might be larger than the original.
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