A free online image resizer, compressor, and converter that never uploads your photos
All Image Resizer handles the jobs people actually run into: making a photo fit an upload form, shrinking a picture so it will attach to an email, turning a camera original into the exact square a platform asks for, or processing a whole folder of product shots before a launch. It resizes, compresses, and converts JPG, PNG, WebP, HEIC, and GIF files, and all of it happens inside your browser.
There is nothing to install, no account to create, and no watermark on the result. Drop a file in, choose the size or format you need, check the before-and-after preview, and download.
Resize, compress, convert: what is the difference?
These three words are often used as if they meant the same thing, but each one changes something different about a picture, and knowing which you need saves a lot of trial and error.
- Resizing. changes the pixel dimensions, for example from 4000 × 3000 down to 1200 × 900. Fewer pixels means a smaller file and a picture that fits the space it will be shown in.
- Compressing. reduces the file size by storing the same pixels more economically, usually by lowering the quality setting of a JPG or WebP. A little compression is invisible, and a lot of it shows as blockiness.
- Converting. changes the file format, such as saving a PNG as a JPG or a HEIC photo from an iPhone as something every site accepts.
Most real tasks combine them. A phone photo of five megabytes usually becomes a clean, light file by resizing it to a sensible width first and then letting a gentle compression do the rest. Resizing by dimensions is the most reliable way to save space without visible damage.
Four tools for four jobs
- Resize Image — Set an exact width and height, scale by percentage, or pick a social media preset. Stretch, Crop, and Fit control what happens when the shape does not match.
- Bulk Resize — Drop up to 30 images, apply the same size and format to all of them, and download the batch as a single .zip file.
- Compress Image — Pick a simple compression level, optionally change the resolution, and get a smaller file in one click.
- Resize Image to KB — Type the file size an upload form allows, in KB or MB, and the tool searches for the best quality that fits under it.
Pick the tool by the problem you have
If you know what the destination wants but not which setting to touch, start from the problem.
| Situation | What to use | Typical target |
|---|---|---|
| An application form rejects your photo as too large | Resize to KB | 100 KB or 50 KB |
| A signature or tiny photo field with a strict cap | Resize to KB | 20 KB |
| A photo is too big to attach to an email | Compress Image | 1 MB or 500 KB |
| Album or podcast artwork | Resize Image | 3000 × 3000 or 1400 × 1400 |
| Product photos for a shop listing | Resize Image | 1000 × 1000 |
| An app icon, sticker, or avatar | Resize Image | 512 × 512 or 128 × 128 |
| A whole folder of photos to prepare | Bulk Resize | One size for the whole batch |
Pixels and kilobytes are different measurements
A form that asks for a photo of 200 × 200 pixels and under 50 KB is asking for two separate things. Pixels describe how large the picture looks. Kilobytes describe how much space the file takes. A plain white-background portrait and a busy street scene can have identical dimensions and very different file sizes.
When a form states both, set the pixel size first and then fit the file size, which is exactly the order the Resize to KB tool follows.
Keeping quality high while the file gets smaller
- Start from the original. A screenshot or a copy that was already compressed has less detail to work with, and each new round of compression makes it worse.
- Resize before you compress. Lowering the pixel count removes bytes cleanly, while heavy compression on a huge image creates visible blocks.
- Prefer Crop or Fit over Stretch. Stretching to a different shape distorts people and products. Crop trims the overflow and Fit adds a neutral background.
- Match the format to the picture. JPG suits photographs, PNG keeps flat graphics, logos, and transparency crisp, and WebP is a good compact choice for the web.
- Do not enlarge small images. Making a picture bigger cannot add detail that was never captured, so it will look soft.
- Check the preview. The Original and Resized panels show dimensions and file size side by side before you download.
Private by design
Every resize, compression, and conversion runs on your own device using your browser's built-in image tools. Your pictures are read from your computer or phone, processed locally, and saved straight back, so no copy ever reaches a server. If you open your browser's network panel while you work, you will not see an image being sent anywhere.
That matters for the pictures people are most careful with: identity documents, signatures, family photos, and unreleased designs. It is also why the tool can stay free, with no sign-up and no watermark: there is no server bill to pass on.
Works on phones, tablets, and desktops
The tool runs in any modern browser, so a photo straight from your camera roll can be prepared for a form in a minute. Files up to 50 MB are accepted, which covers most camera originals. HEIC photos from iPhones open natively in Safari, while support in other browsers varies.
Who uses it
- Students and job applicants. preparing photos, signatures, and scanned documents for online forms with strict limits.
- Online sellers. making product photos square, consistent, and light enough to load fast.
- Bloggers and site owners. shrinking images before uploading them, to keep pages quick.
- Designers and developers. exporting icons, avatars, and thumbnails at exact pixel sizes.
- Podcasters and musicians. producing artwork at the sizes that directories and distributors ask for.
Whichever describes you, the quickest way to start is the upload area at the top of this page. Drop in a picture, set the size, and see the result before you download it.
Picking a preset switches to Pixels so you can fine-tune the exact size.