Tumblr Image Post Resizer
Tall images take up the most room on the Tumblr dashboard. This page resizes art, photos and edits to 1280×1920, a 2:3 portrait at Tumblr's full image width. 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:
Tall posts that stand out
Width decides quality. Tumblr keeps the full quality up to 1280 pixels wide. A 1280×1920 portrait is shown at full column width on the dashboard and stays crisp when someone clicks through.
2:3 is the sweet spot. It's tall enough to fill a phone screen while scrolling, without being cut off. Much taller images — long comics, infographics — still post fine, but readers have to scroll.
Art and edits. Sign or watermark your art before posting; reblogs travel far. Our watermark tool adds a name or logo in a few seconds.
Posters and covers are usually 2:3 already, so they fit without cropping.
More Tumblr and portrait sizes
Tall formats and the rest of Tumblr:
Frequently asked questions
What is the best image size for a Tumblr post?
1280 pixels wide. A 1280×1920 (2:3) portrait fills the dashboard column and stays sharp when opened.
Which size should I resize to for Instagram, YouTube or Facebook?
Check our social media image sizes guide. It gives the exact pixels and aspect ratio for every post, story, cover and profile picture on each platform, with links that open this resizer already set to the most common ones.
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.