Photos & forms

How to convert WebP to JPG (and PNG to JPG) on your phone or computer

You save an image, try to upload it to a form, and it is refused because it is a .webp file. Converting it to JPG takes seconds once you know what is happening.

By the CALQEVA editorial team15 October 20262 min read

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Why your image is a WebP file

WebP is an image format made for websites. It keeps photos looking good at a much smaller file size than JPG, so most large websites now send their images as WebP. When you save an image from a site in Chrome, or download a product photo or a logo, it often arrives as a .webp file even though it looks like any other picture.

WhatsApp stickers, many screenshots shared from apps and images copied from social media can also be WebP. On phones the file name may not even show the extension, which makes the problem confusing when an upload fails.

Why forms and apps reject WebP

Government portals, exam and job applications, banks and many older apps accept only JPG, and sometimes PNG or PDF. Their upload check looks at the file type, so a WebP image is refused even when its size and dimensions are correct. Some photo editors and printing shops also cannot open WebP.

Renaming the file from .webp to .jpg does not help. The contents stay WebP, and a careful portal will still reject it or show a broken image after upload. The image needs to be converted.

JPG, PNG or WebP: which should you pick?

If you are unsure, choose JPG. If the image has a transparent background, such as a logo, converting to JPG fills the transparent part with a solid colour; white is the usual choice and is what most forms expect. In short:

JPG: the safe choice for photos and for any form or portal. Small files, opens everywhere. Does not support transparent areas.
PNG: best for screenshots, logos and images with text or sharp edges. Keeps transparency and every pixel, but files are larger.
WebP: best for your own website. Smallest files, but not accepted everywhere.

Convert in four steps

Open the image converter on your phone or computer, then:

Choose JPG, PNG or WebP as the format you want.
Pick your images. You can select several at once: WebP, PNG, JPG, GIF, AVIF, BMP and SVG all work.
For JPG or WebP, set the quality. 85 to 90% keeps photos looking the same with a much smaller file.
Download each converted image, or all of them together.

Your photos stay on your device

Many converter websites upload your file to their server, convert it there and send it back. That is a poor idea for ID photos, signatures and documents. CALQEVA converts images inside your browser, so the picture never leaves your phone or computer, and it works even on a slow connection once the page has loaded.

If the form also has a size limit

Converting changes the format, not necessarily the size. If a portal asks for a JPG between 20 and 50 KB, or a fixed size in pixels, convert first and then use the image resizer to hit the exact KB range and dimensions. Our guide to reducing a photo to 20 KB or 50 KB explains how to read those requirements.

If the form wants a PDF instead of an image, combine your JPGs into one document with JPG to PDF.

iPhone photos in HEIC format

iPhones save photos as HEIC by default, another format that many forms refuse. Most browsers cannot open HEIC files directly. The simplest fix is in the iPhone itself: go to Settings, then Camera, then Formats, and choose Most Compatible so new photos are saved as JPG. For a photo you already have, sharing it by email or through the Files app usually converts it to JPG automatically.