Resize Image to A3 Size

A3 is double A4 — 297 × 420 mm — the size of small posters, charts and presentation boards. At 300 DPI it is 3508 × 4961 pixels. Everything runs in your browser — nothing is uploaded. Need a smaller file instead? Compress or convert.

or drop images here — or press Ctrl + V to paste

JPG · PNG · WebP · GIF · BMP — no size limit, no sign-up

Width (px)

Height (px)

Unit

DPI

Keep aspect ratio (set one, the other follows)

Scale 50%

Aspect ratio

Width in pixels (optional)

Fit whole image inside instead of cropping to fill (result may be smaller than the preset)

Output format

Output quality 90

Position & zoom

Zoom 100%

Drag the preview to choose which part of the image is kept. The same framing is used for every image in the batch.

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resized

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new size

Added 0 files

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.

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Exact or proportional

Set precise pixels with aspect-ratio lock, scale by percentage, or pick a preset. Whatever the target needs.

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Batch, instantly

Resize a whole folder at once to the same dimensions. No upload wait, no queue, no file limit.

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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:

Resize to 1920×1080 Resize to 1080×1080 Resize to 1280×720 Resize for Instagram Resize for YouTube

Other image tools:

Image Converter Image Compressor Image Cropper Image Watermark

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:

8 × 8 10 × 10 16 × 16 28 × 28 32 × 32 40 × 40 50 × 50 64 × 64 96 × 96 98 × 98 100 × 100 112 × 112 120 × 120 128 × 128 144 × 144 150 × 150 180 × 180 184 × 184 192 × 192 200 × 200 240 × 240 250 × 250 256 × 256 300 × 300 320 × 320 350 × 350 360 × 360 400 × 400 450 × 450 480 × 480 500 × 500 512 × 512 600 × 600 640 × 640 700 × 700 800 × 800 840 × 840 900 × 900 1000 × 1000 1024 × 1024 1080 × 1080 1100 × 1100 1200 × 1200 1300 × 1300 1400 × 1400 1500 × 1500 1600 × 1600 1920 × 1920 2000 × 2000 2048 × 2048 2400 × 2400 2500 × 2500 3000 × 3000 4000 × 4000 5000 × 5000 6000 × 6000

Landscape sizes

Wider than tall — screens, banners, covers and thumbnails:

64 × 32 140 × 110 150 × 100 200 × 150 300 × 80 300 × 250 320 × 240 400 × 150 480 × 360 512 × 128 512 × 256 555 × 425 600 × 240 600 × 400 (3:2) 640 × 360 640 × 480 (4:3) 680 × 240 800 × 600 (4:3) 851 × 315 900 × 600 1000 × 500 1024 × 576 (16:9) 1080 × 566 1128 × 191 1200 × 628 1200 × 630 1200 × 675 (16:9) 1200 × 800 1200 × 900 1280 × 700 1280 × 720 (HD) 1366 × 768 1500 × 500 1500 × 1000 (3:2) 1600 × 900 1920 × 1080 (Full HD) 1920 × 1200 (16:10) 2048 × 1152 (2K) 2560 × 1440 (1440p) 2660 × 1140 (banner) 3000 × 1500 3440 × 1440 3840 × 2160 4080 × 3060

Portrait sizes

Taller than wide — passport photos, forms and phone screens:

Change the aspect ratio

Fit an image to a ratio without choosing pixels:

Any aspect ratio 16:9 4:3 3:2 1:1 4:5 5:4 3:4 2:3 9:16 21:9 5:2

Paper, print & photo sizes

Paper and photo sizes in mm, cm and inches, plus DPI tools:

A5 A4 A3 Letter Legal 4R (4 × 6 in) Postcard Stamp size Signature 2.5 × 2.5 cm 3 × 4 cm 3.3 × 4.8 cm 3.5 × 2.5 cm 3.5 × 3.5 cm 3.5 × 4.5 cm 3.5 × 5 cm 3.81 × 3.81 cm 4 × 3 cm 4 × 4 cm 4 × 5 cm 4 × 6 cm 4.5 × 3.5 cm 5 × 5 cm 5 × 7 cm 5.08 × 5.08 cm 25 × 25 mm 30 × 40 mm 32 × 26 mm 33 × 48 mm 35 × 35 mm 35 × 45 mm 35 × 50 mm 35 × 54 mm 36 × 36 mm 38.1 × 38.1 mm 40 × 50 mm 45 × 35 mm 45 × 38 mm 47 × 36 mm 50 × 50 mm 50 × 70 mm 50.8 × 50.8 mm 51 × 51 mm 52 × 40 mm 1.18 × 1.57 in 1.30 × 1.89 in 1.38 × 1.38 in 1.38 × 1.77 in 1.5 × 1.5 in 1.97 × 2.76 in 2 × 2 in 3 × 3 in 4 × 6 in 5 × 7 in 6 × 4 in 8 × 10 in 8.5 × 11 in Resize in pixels Resize in cm Resize in mm Resize in inches Resize by percentage 72 DPI converter 100 DPI converter 150 DPI converter 200 DPI converter 300 DPI converter 600 DPI converter

Resize for a platform

Ready-made sizes for social profiles and posts:

Resize tools

Batch resizing, DPI and crop tools:

Bulk image resizer Resize for printing Image DPI converter Image DPI checker Circle crop Square crop

Poster-size prints at A3

Pixels for A3: 3508 × 4961 at 300 DPI — about 17 megapixels. A modern phone photo (12 MP) is slightly short of that.

150–200 DPI is usually enough. Posters are seen from a metre or more away. At 200 DPI A3 is 2339 × 3307 pixels, which most photos can fill properly. Change the DPI box to 200 before resizing if your source is small.

Text on a poster should be large — at A3, body text below about 14 pt is hard to read from a distance.

Printing at home? Many home printers only take A4. Print shops handle A3, and some want a PDF — convert the result with JPG to PDF.

Smaller: A4. US poster: 24×36 inch.

Similar print and photo sizes

Nearby print sizes, saved at 300 DPI so they print at the right size:

Legal Letter 8.5 × 11 in 8 × 10 in A5 5 × 7 in 4 × 6 in 4R (4 × 6 in)

Frequently asked questions

What resolution do I need for an A3 print?

3508×4961 pixels for 300 DPI, or 2339×3307 for 200 DPI, which is fine for posters viewed from a distance.

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.