Smart Image Resizer

Resize your images to exact dimensions, percentage or social media presets and export them in your chosen format directly in your browser.

Tap to upload or drop images

JPG, PNG, WebP, AVIF, BMP, SVG, ICO (Up to 50MB, Batch Supported)

0 Preparing...

Resize Settings

Enter your desired size here. After uploading, width and height stay empty so you can enter your own dimensions. With Lock Aspect Ratio enabled, the other value follows automatically.

WIDTH (PX)

HEIGHT (PX)

UNIT

Enter a width or height to begin. With Lock Aspect Ratio on, the other value fills automatically. Maximum output width or height: 20,000 pixels.

Lock Aspect Ratio

Save Image As

Target File Size (optional)

Set a maximum output file size. Works for JPG, WebP and AVIF output.

More options Fit • No upscale

Prevent Upscaling Beyond Original Dimensions

Quick Presets

Resize Behavior

Fit: keeps the whole image visible inside the requested dimensions without cropping.

Fine-tune Visual Quality

90%

Visual Resize Preview (Drag Box)

Resized Original

Exact output size • updates automatically

Original dimensions 0 × 0 px

New dimensions 0 × 0 px

Original size 0 KB

Resized size 0 KB

Have a suggestion or found a bug? Let us know so we can fix it right away!

Effortlessly Resize High-Resolution Images Online

The SAFIX Smart Image Resizer lets you change image dimensions without installing desktop software. Resize by exact size in pixels, inches, centimeters or millimeters, by percentage, or with ready-made social media presets. You can lock the aspect ratio, set a maximum file size and keep every image in its original format.

Resize Images in Your Browser

For supported image types, resizing happens locally in your browser. Your selected image is used to generate the new dimensions on your device instead of being sent to SAFIX for processing.

Step-by-Step Guidelines to Use This Tool

Tap the upload box or drag and drop one or multiple images.
Optionally import images from Google Drive or Dropbox.
Choose By Size, As Percentage or Social Media, then enter the size, drag the percentage slider or pick a platform preset.
Keep Lock Aspect Ratio enabled when you want to prevent distortion.
Choose Fit, Fill, or Stretch depending on whether you want to preserve the whole image, crop it, or force exact dimensions.
Choose Original or another output format, optionally set a target file size, and adjust quality for lossy formats.
Check Original vs New dimensions and the resulting file size, then download.

Every Button and Feature Explained

Upload / Drop Zone: Tap the dashed box or drag images onto it. Multiple images are supported for batch resizing.

Google Drive & Dropbox: Use the official cloud pickers to select images without manually browsing local storage.

By Size: Enter exact width and height values. Choose pixels, inches, centimeters or millimeters from the Unit menu.

DPI: Shown for inches, centimeters and millimeters. It converts physical size into pixels and is saved inside JPG and PNG files.

As Percentage: Drag the slider to make the image a chosen percentage of its original size. The slider runs from 1% to 200%, so you can enlarge as well as shrink.

Social Media: Pick a platform and a preset type, and the width and height are filled in for you. Presets always produce the exact size.

Background Fill: In the Social Media tab, keep the whole image visible and fill the empty space with a colour you choose, instead of cropping.

Save Image As: Original keeps each image in its own format; JPG, WEBP, PNG, AVIF, BMP and ICO convert the result.

Target File Size: Optionally set a maximum size in KB or MB. SAFIX lowers JPG, WebP or AVIF quality just enough to stay under it.

Lock Aspect Ratio: Automatically keeps the original width-to-height relationship when you change one dimension.

Prevent Upscaling: Stops the By Size tab from creating dimensions larger than the original image when enabled. As Percentage and Social Media are not limited by it.

Quick Presets: One-tap dimensions for common 16:9, square, portrait, story, cover, and small-square use cases.

Fit: Keeps the full image visible inside the requested canvas.

Fill: Covers the requested canvas and crops the excess edges.

Stretch: Forces the full image into the exact target dimensions, which can change its proportions.

Visual Resize Preview: Drag the divider to compare the original with the resized output before downloading.

Stats Box: Shows original dimensions, new dimensions, original file size, and resized file size.

Resize Image / Download: Generates the final files in your browser. Batch results can be downloaded individually or together as a ZIP.

High-Fidelity Pixel Reduction

When a large image is reduced to much smaller dimensions, a simple one-step resize can make edges look soft or fine textures disappear. SAFIX uses the same high-quality multi-pass downsampling pipeline used by its image-compression engine, then applies a restrained detail-recovery pass for stronger edge definition without intentionally shifting the image's natural color.

Why Use SAFIX?

100% Free: No premium tier or watermark.
Privacy-focused: Resizing is performed locally in your browser.
No Sign-Up: Upload and resize without creating an account.
Exact Control: Use pixels or physical units, percentage scaling, or social media presets.
Batch Ready: Resize multiple images with the same settings.
Works Everywhere: Responsive on modern mobile, tablet, and desktop browsers.

Whether you need a profile picture at an exact dimension, a social-media square, a website hero image, or a batch of smaller web images, SAFIX provides practical resize controls without requiring a desktop application.

Which Image Size Should You Choose?

The right dimensions depend on where the picture will be shown, not on how large the original happens to be. Use the table below as a starting point, and always confirm the current requirement of the website or platform you are uploading to, because recommended sizes change over time. The Social Media tab in the tool already includes common sizes for Facebook, Instagram, YouTube, X, LinkedIn, Pinterest, WhatsApp and TikTok.

Use	Suggested size	Shape	Suggested behavior
Widescreen banner, presentation slide, video thumbnail	1920 × 1080	16:9	Fill to cover the area, Fit to keep everything
Square social post or marketplace listing	1080 × 1080	1:1	Fill for edge-to-edge, or Fit with JPG for a white border
Portrait feed post	1080 × 1350	4:5	Fill
Story or vertical cover image	1080 × 1920	9:16	Fill
Link preview or sharing image	1200 × 630	About 1.9:1	Fill
Small thumbnail or profile image	800 × 800	1:1	Fill, with the subject near the center
Image inside a web page or blog post	The width your layout displays	Same as original	Keep Lock Aspect Ratio on
Photo for a form or application portal	Exactly what the portal states	As required	Lock off, then Fit or Fill

Resize, Compress or Convert: Which One Do You Need?

These three jobs are easy to confuse, and choosing the wrong one is the most common reason an upload keeps failing.

Resize when the pixel dimensions are wrong, for example an image that is too wide for a layout or must be an exact square.
Compress when the only problem is a file-size limit such as "under 200 KB". Use the Image Compressor for that.
Convert when the destination does not accept the file type you have. Use the Image Converter for that.

The jobs often work together. A sensible order for a very large photo is to resize first, so the picture has the right dimensions, and then compress it if a size limit still applies.

Common Resizing Mistakes to Avoid

Enlarging a small image. Making an image bigger adds pixels but not detail, so the result stays soft. This is why Prevent Upscaling is switched on by default.
Using Stretch to force a new shape. Stretch changes the proportions of faces, circles and text. Choose Fit to keep the whole picture or Fill to crop it instead.
Resizing an already resized copy again and again. JPG and WebP files are re-encoded every time they are saved. Keep the original and always resize from it.
Choosing PNG for ordinary photographs. PNG is lossless, so photo files can stay large. JPG or WebP is usually the better output unless you need transparency.
Forgetting to check the edges after Fill. Fill crops the sides or the top and bottom. Look at the preview to be sure nothing important was cut off.
Ignoring the destination's own rules. A portal may require exact dimensions, a maximum size and a specific format all at once. Check all three before you upload.

For a complete walkthrough of every setting, read the full Image Resizer guide.

Frequently Asked Questions

How do I resize an image?

Upload your image, choose By Size, As Percentage or Social Media, enter the size or pick a preset, select the output format, then press Resize Image.

Can I resize an image to an exact width and height?

Yes. Enter the exact width and height in pixels, inches, centimeters or millimeters. Disable Lock Aspect Ratio only when you intentionally want a different proportion.

Can I resize an image in inches, centimeters or millimeters?

Yes. Choose Inches, Centimeters or Millimeters in the Unit menu and pick a DPI, such as 300 for printing. SAFIX converts the physical size into pixels and saves the DPI value inside JPG and PNG files.

Can I resize an image by percentage?

Yes. Open the As Percentage tab and drag the slider from 1% to 200% of the original size. Going above 100% enlarges the image, which adds pixels but not detail.

Can I set a maximum file size for the resized image?

Yes. Enter a limit in KB or MB under Target File Size. SAFIX lowers the quality of JPG, WebP or AVIF output just enough to stay under it, and tells you if the limit cannot be reached at the chosen dimensions. PNG, BMP and ICO output ignore this setting.

Can I resize multiple images at once?

Yes. Select multiple images and SAFIX will apply the same resize settings to the batch. You can download results one by one or use the batch ZIP download.

What happens if I enable Prevent Upscaling?

In the By Size tab, SAFIX will not create a width or height larger than the original image, which is useful when your goal is only to make images smaller. The As Percentage and Social Media tabs always give the size you ask for.

Will resizing an image reduce its quality?

When you reduce dimensions, some fine detail can naturally be lost because fewer pixels remain. SAFIX uses high-quality canvas resampling to make that reduction as clean as possible.

What is the difference between Fit, Fill and Stretch?

Fit keeps the whole image visible, Fill crops excess areas to cover the exact target, and Stretch forces the image to the exact dimensions and may distort it.

Does SAFIX upload my images to a server?

The resizing operation runs locally in your browser. Google Drive and Dropbox are optional third-party import services and have their own provider-specific privacy behavior.

Which formats are supported?

JPG, JPEG, PNG, WEBP, AVIF, BMP, SVG and ICO inputs are supported when the browser can decode them. Output availability can vary by browser for newer formats such as AVIF.

Does SAFIX try to preserve detail when reducing pixels?

Yes. When the image is reduced significantly, SAFIX uses multi-step high-quality downsampling followed by a restrained detail-recovery pass. This helps retain edge clarity, fine detail and natural color. It cannot recreate information that was never present in the reduced pixel grid, but it reduces avoidable softness from a single aggressive downscale.

Can I resize an image without changing its aspect ratio?

Yes. Keep Lock Aspect Ratio enabled. Change one dimension and SAFIX calculates the other based on the original proportions.

Can I resize an image for social media?

Yes. Open the Social Media tab, choose a platform such as Instagram, Facebook, YouTube, X, LinkedIn, Pinterest, WhatsApp or TikTok, and pick a preset type. SAFIX fills in the width and height. Platforms change their recommended sizes from time to time, so check the current requirement before uploading.