Are my files uploaded to a server?

No. All processing is done in your browser, and your image files are never sent to any external server. You can safely use this tool even with ID photos containing personal information.

What image formats are supported?

JPEG, PNG, WebP, GIF, BMP and HEIC (iPhone photos) are supported. You can also convert to JPEG, PNG or WebP when resizing.

Can I maintain the aspect ratio?

Yes. In pixel mode, turn on "Keep aspect ratio" and the other side is calculated automatically when you enter either the width or the height (based on the first image's ratio).

How many files can I resize at once?

Select as many as you need and resize them in one go. There is no fixed cap on how many files or how large they are; it depends on your device's memory. No sign-up is needed and there is no daily limit.

Will resizing reduce image quality?

Saving as PNG is lossless. For JPEG and WebP you can set the quality with the slider, which starts at 95%. Downscaling rarely causes noticeable loss, but enlarging can make images look rough.

I don't know the right size for social media

Choose "By purpose" to instantly select sizes for major platforms including LINE, X, Instagram, Facebook, YouTube and TikTok. Presets marked "(recommended)" use the size that platform's official help recommends. Instagram portrait posts, YouTube banners and more are included.

Which size should I use for ID photos?

There are ID photo presets: passport and My Number card are 35×45 mm (413×531 px), driver's license is 24×30 mm (283×354 px) and resume photos are 30×40 mm (354×472 px). All are output at the pixel size for 300 dpi.

What's the best size for TikTok posts?

Select the "TikTok post (portrait)" preset to resize to 1080×1920 px (9:16 vertical). We couldn't find a recommended pixel size in TikTok's official help, so treat this size as a guideline.

How do I resize many images to the same width?

Add all the images, choose "In pixels", enter the width and keep "Keep aspect ratio" on. Every image is scaled to that width with its height adjusted to match, and you can download them as one ZIP.

What is the difference between Fit inside and Fill the frame?

Fit inside shrinks the image until all of it fits inside the target size, so it may come out smaller than the target. Fill the frame covers the whole target and crops whatever spills over the edges.

Image Resizer

Resize many images at once by pixels, by percentage, or to social media and ID photo sizes, and download them as a ZIP. Free, no sign-up, and your images are never uploaded.

Your input stays in your browser and is never sent.

Drop images here, or click to chooseJPG, PNG, WebP, GIF, BMP and HEIC. You can pick several at once. Images are processed on this device and never uploaded

What Is Image Resizing?

Image resizing changes the width and height of JPG, PNG and WebP images. It is useful for standardizing images for websites, creating profile pictures for social media and adjusting resolution for print, wherever you need images at specific dimensions.

SOKUFU's image resizer runs entirely in your browser, so your images are never uploaded to a server. It supports both pixel and percentage sizing, with the option to keep the original aspect ratio.

Whether you need to standardize product images for an online store, lighten blog images or resize photos for a presentation, this tool handles it quickly. You can resize many files at once, with no sign-up, no login and no usage limits.

How to Resize Images

ChooseDrop image files or click to choose them. You can pick several at once.
AdjustUnder "How to set the size", choose "In pixels", "By percentage" or "By purpose", then set the size.
AdjustOptionally change "When the aspect ratio differs" or "Save as".
SaveClick "Resize", then download the images one by one or all at once as a ZIP.

Features of SOKUFU's Image Resizer

Privacy Protection: Images are never uploaded to a server. All processing happens in your browser.
Social Media Presets: One-click presets in 20 sizes for platforms including LINE, X, Instagram, Facebook, YouTube, TikTok and pixiv.
Three Ways to Set the Size: Choose from pixel dimensions, percentage scaling or presets by purpose.
Fit Options: Four ways to handle a different aspect ratio: fit inside, fill the frame, stretch, or fit inside and fill the gap with a color.
Format Conversion: Save as JPEG, PNG or WebP.
Batch Processing: Resize multiple files at once and download them as a ZIP.
A Note on Enlarging: Enlarging an image here stretches its pixels, so edges get blurry. To make it 2x or 4x larger while keeping it sharp, use the AI Image Upscaler.

Use Cases for Image Resizing

Social Media Posts: Resize images to preset sizes for LINE, X, Instagram, YouTube and TikTok. Pick the preset and the numbers are filled in for you.
Websites & Blogs: Resize OGP images and thumbnails to specific dimensions. This also helps pages load faster.
Email Attachments: Shrink oversized images to meet email attachment size limits.
ID Photos & Print: Presets for passport and My Number card (35×45 mm), driver's license (24×30 mm) and resume photos (30×40 mm). A4 at 300 dpi is also available for print-ready resizing.

Image Resizer FAQ

Are my files uploaded to a server?: No. All processing is done in your browser, and your image files are never sent to any external server. You can safely use this tool even with ID photos containing personal information.
What image formats are supported?: JPEG, PNG, WebP, GIF, BMP and HEIC (iPhone photos) are supported. You can also convert to JPEG, PNG or WebP when resizing.
Can I maintain the aspect ratio?: Yes. In pixel mode, turn on "Keep aspect ratio" and the other side is calculated automatically when you enter either the width or the height (based on the first image's ratio).
How many files can I resize at once?: Select as many as you need and resize them in one go. There is no fixed cap on how many files or how large they are; it depends on your device's memory. No sign-up is needed and there is no daily limit.
Will resizing reduce image quality?: Saving as PNG is lossless. For JPEG and WebP you can set the quality with the slider, which starts at 95%. Downscaling rarely causes noticeable loss, but enlarging can make images look rough.
I don't know the right size for social media: Choose "By purpose" to instantly select sizes for major platforms including LINE, X, Instagram, Facebook, YouTube and TikTok. Presets marked "(recommended)" use the size that platform's official help recommends. Instagram portrait posts, YouTube banners and more are included.
Which size should I use for ID photos?: There are ID photo presets: passport and My Number card are 35×45 mm (413×531 px), driver's license is 24×30 mm (283×354 px) and resume photos are 30×40 mm (354×472 px). All are output at the pixel size for 300 dpi.
What's the best size for TikTok posts?: Select the "TikTok post (portrait)" preset to resize to 1080×1920 px (9:16 vertical). We couldn't find a recommended pixel size in TikTok's official help, so treat this size as a guideline.
How do I resize many images to the same width?: Add all the images, choose "In pixels", enter the width and keep "Keep aspect ratio" on. Every image is scaled to that width with its height adjusted to match, and you can download them as one ZIP.
What is the difference between Fit inside and Fill the frame?: Fit inside shrinks the image until all of it fits inside the target size, so it may come out smaller than the target. Fill the frame covers the whole target and crops whatever spills over the edges.