Twitter Banner Resizer
Twitter — now X — wants header images at 1500×500 pixels, a 3:1 letterbox. This page resizes any photo or graphic to that exact size in your browser, so you are not guessing at dimensions or letting the upload crop for you. Everything runs in your browser — nothing is uploaded. Need a smaller file instead? Compress or convert.
Drag the preview to choose which part of the image is kept. The same framing is used for every image in the batch.
How to resize an image
Resizing changes the pixel dimensions of an image — making it fit a specific width, a percentage of the original, or a platform's required size. Smaller dimensions also mean a smaller file, which is why resizing is one of the most effective ways to speed up a page.
- Add your images, or drop them in.
- Choose By dimensions for an exact width and height, By percentage to scale, or a Preset for common social and screen sizes.
- Click Resize, then download each file or grab them all as a ZIP.
Exact or proportional
Set precise pixels with aspect-ratio lock, scale by percentage, or pick a preset. Whatever the target needs.
Batch, instantly
Resize a whole folder at once to the same dimensions. No upload wait, no queue, no file limit.
Nothing is uploaded
Your images are resized by your own browser and never sent to a server, so they stay completely private.
Resize for a specific platform
Jump to a common size:
Other image tools:
Will resizing reduce quality?
Making an image smaller is safe — you are discarding pixels you no longer need, and the result looks clean. Making an image larger than its original is where quality suffers, because the browser has to invent pixels that were never there, which looks soft or blocky.
As a rule: resize down freely, but avoid scaling up much beyond the original dimensions. If you need a smaller file rather than smaller dimensions, use the compressor instead.
Square sizes
Same width and height — profile photos, icons, product shots:
Landscape sizes
Wider than tall — screens, banners, covers and thumbnails:
Portrait sizes
Taller than wide — passport photos, forms and phone screens:
Change the aspect ratio
Paper, print & photo sizes
Paper and photo sizes in mm, cm and inches, plus DPI tools:
Resize for a platform
Ready-made sizes for social profiles and posts:
Resize tools
Batch resizing, DPI and crop tools:
Designing for a 1500×500 header
3:1 is an extreme shape. Almost no photo is born that wide, so getting to 1500×500 means throwing away most of the vertical frame — a standard 4:3 phone photo loses around 60% of its height. Landscapes, textures, gradients and abstract backgrounds handle that well. Photos with a subject in the middle rarely do. If yours has a face or a product in it, crop the strip you want first with the cropper, then resize.
Your avatar sits on top of the banner. The profile picture overlaps the lower-left corner of the header, and on the web the bottom edge is partly covered by the profile name and bio block. Keep logos and any text out of the lower left and away from the bottom edge entirely.
Mobile crops the top and bottom. The full 3:1 frame is what desktop shows; phone apps display a shallower slice of it. Anything you need everyone to see belongs in the horizontal centre band, not near the top or bottom edges.
Format and file size. PNG keeps gradients and text edges clean and is the safer pick if your banner contains type. JPG is smaller and fine for photographic backgrounds. Twitter re-compresses uploads regardless, so staying comfortably under the 5MB limit and starting from a sharp 1500×500 file gives the best result. If you need the file smaller, use the compressor after resizing.
Layouts and safe areas change from time to time, so check your profile on both phone and desktop after uploading rather than trusting a template.
Frequently asked questions
What size should a Twitter (X) banner be?
1500×500 pixels, a 3:1 ratio, under 5MB, as PNG or JPG. Upload the full 1500×500 image — the apps crop it down themselves for smaller screens, so keep important elements in the centre and clear of the lower-left corner where your avatar sits.
What is the difference between resizing and compressing?
Resizing changes the dimensions (the width and height in pixels). Compressing keeps the dimensions but reduces the file size by lowering quality. Resizing down does both at once, which is why it is so effective. For file size alone, use the compressor.
Will the aspect ratio be kept?
In dimensions mode, tick "Keep aspect ratio" and set just the width or height — the other is calculated automatically so the image is not stretched. Untick it to force exact dimensions, which may distort the image.
Can I resize many images at once?
Yes. Drop in as many as you like and they are all resized to the same setting in one go, then you can download them together as a ZIP. There is no limit on how many.
Are my images uploaded?
No. Resizing happens entirely in your browser. Nothing is transmitted or stored, and you can disconnect from the internet after the page loads and it still works.
Which format will I get back?
Images keep their original format where the browser supports it (JPG, PNG, WebP). Formats a browser cannot write, like GIF or BMP, come back as PNG. To change format on purpose, use the converter.