Image resizer – change image size in pixels or percent
Chat shortcut: /resize
Use this image resizer to shrink an image or set its exact size: enter the width or height in pixels or choose a preset, and keep the aspect ratio if you like. Processing happens in your browser; only HEIC, AVIF or TIFF files your browser can't read go briefly to ChatX for conversion.
No AI No Sign-Up
Images are processed in your browser, nothing is uploaded. Only HEIC/HEIF (and AVIF/TIFF if your browser can’t read them) are briefly sent to ChatX for conversion.
Fewer pixels, the right dimensions, a smaller file
A phone photo easily has 4,000 pixels of width and several megabytes. On a website that slows down loading, in emails it blows up attachments, and portals reject images that are too large. Shrunk to 1,920 pixels or less, the photo usually looks unchanged on screen and takes up considerably less space.
You enter the target dimensions in pixels or choose a preset: Full HD, 1280 or 800 pixels for the longest side (so the height for portrait format), Instagram, half or a quarter of the original size, or the 35 × 45 mm photo size common in Europe (413 × 531 pixels), for which the image is filled and center-cropped. With the aspect ratio locked, one value is enough: the second side is calculated to match, and nothing gets distorted.
You can keep the format or switch it: JPG for photos, PNG for graphics with transparency, WebP for especially small files. If the image then still needs to get under a certain kilobyte limit, “Image compressor” helps afterwards.
How it works
- 1
Open the image
Drag a JPG, PNG, WebP or GIF into the field, paste it from the clipboard or select it.
- 2
Choose a preset or dimensions
Pick a preset such as Full HD, Instagram or the 35 × 45 mm photo, or enter the width and height in pixels yourself.
- 3
Set aspect ratio and format
Leave “Keep aspect ratio” active and choose whether the format stays or becomes JPG, PNG or WebP.
- 4
Resize and save
Click “Let’s go”, check the preview and download the image.
Typical uses
Photos for your own website
Shrink to Full HD or 1280 pixels so pages load faster and the storage space lasts.
European ID and application photos
The 413 × 531 pixel preset matches the 35 × 45 mm size used in Germany and much of Europe when printed at 300 dpi; the tool center-crops to fit. For a US 2 × 2 inch passport photo, use the Passport photo maker.
Instagram, Facebook and YouTube
For example 1080 pixels wide for posts or 1280 × 720 for thumbnails, so the image matches the platform’s usual specs.
Email attachments and messaging apps
Shrink to 1280 or 800 pixels so several images fit in one message.
Screenshots for documentation
Scale to 50% and save as PNG so text stays sharp and the file gets small.
Good to know
- Input: JPG, PNG, WebP and GIF; output optionally in the original format (GIF becomes a PNG still image), as JPG, PNG or WebP.
- Presets: 50%, 25%, Full HD (1920 px), 1280 px, Instagram (1080 px) and 800 px, each for the longest side, plus a 35 × 45 mm photo preset (European ID/application size, 413 × 531 px, center-cropped); and free dimensions in pixels.
- “Keep aspect ratio” calculates the second side automatically and prevents distortion.
- Shrinking usually stays sharp; enlarging creates no new details, for that there is “Image upscaler”.
- Processing in the browser, no transfer to a server; HEIC, AVIF and TIFF are only sent briefly to ChatX for conversion if the browser cannot read them.
- Up to 100 megapixels per image; the server conversion for HEIC, AVIF and TIFF accepts files up to 50 MB.
- Free, no sign-up and no AI; also available in the chat with the /resize shortcut.
Frequently asked questions
How do I change the image size without losing quality?
When shrinking, a photo usually stays sharp, because pixels are only merged. Check the result in the preview and save as PNG if every detail counts.
How do I enlarge an image without losing quality?
Plain scaling invents no details, so an enlarged image looks soft or pixelated. For real enlargement use “Image upscaler” with AI.
What size is the 35 × 45 mm photo preset?
35 × 45 mm (3.5 × 4.5 cm) is the usual size for application and ID photos in Germany and much of Europe; at 300 dpi that is 413 × 531 pixels. The preset fills these dimensions and center-crops; for your own framing, crop the photo to 7:9 first. You set the dpi when printing; the file doesn't carry it. For US passport photos (2 × 2 inches), use the Passport photo maker.
How is this different from compressing and cropping?
Resizing changes the pixel dimensions of the whole image. Compressing makes the file smaller and usually leaves the dimensions unchanged. Cropping trims the edges and gives the image a particular aspect ratio. There are separate tools for compressing and cropping.
Will the image be distorted?
Not as long as “Keep aspect ratio” is active: then the tool calculates the second side automatically. Only uncheck it if you deliberately want to set both dimensions freely.
What dimensions do I need for Instagram, YouTube and the like?
Common examples: Instagram posts 1080 pixels wide (Story 1080 × 1920), YouTube thumbnails 1280 × 720, Facebook posts 1200 × 630. For Instagram and 1280 pixels there are presets, enter anything else as custom dimensions; the platform states the current specifications.
Does the file stay on my device?
Yes, the computation runs in the browser. The only exception: HEIC, AVIF or TIFF are sent briefly to ChatX for conversion if your browser cannot read the format.