Fast · Private · Free
Convert up to 50 images at once. Fast, private, and free — with processing designed to happen directly in your browser.
WebP — Smaller files with excellent web quality.
Processed privately in your browser
How it works
There is no sign-up, no upload queue and no email step. The whole workflow happens on this page.
Drop up to 50 images into the converter, or pick them from your device.
Select your output format and, if you want to, adjust quality or size.
KuConvert processes the batch in the background while the page stays responsive.
Take individual files, or download the whole batch as one ZIP archive.
Use cases
KuConvert handles up to 50 images at a time, so most of these are a single pass rather than an afternoon.
Convert a folder of JPG and PNG assets to WebP or AVIF before they go live. Hero and product images are usually the Largest Contentful Paint element, so this is one of the few page-speed wins that needs no code change.
JPG, PNG → WebP, AVIF
A form that caps uploads at a few megabytes will usually accept the same photo re-encoded. Drop the batch in, pick JPG or WebP, and take the whole set back at a fraction of the size.
PNG, BMP, TIFF → JPG
Some software still refuses WebP and AVIF. Converting to PNG keeps the alpha channel intact so logos and cut-outs drop straight into a layout without a white box behind them.
WebP, AVIF, SVG → PNG
Re-encoding rebuilds an image from its pixels, so EXIF timestamps, camera details and GPS coordinates do not survive the conversion. Useful before anything gets posted publicly.
Any source → any output
Formats
Read almost anything your browser can decode; write WebP, JPG, PNG and AVIF. Availability is checked in your browser before a format is offered.
The most widely supported photographic format. Excellent for photographs, but it cannot store transparency.
Typical use: Photography, email attachments, print sources
JPG to WebP converterLossless format with full alpha transparency. Ideal for logos, screenshots and interface assets where sharp edges matter.
Typical use: Logos, screenshots, UI assets, illustrations
PNG to WebP converterModern web image format designed for high visual quality at smaller file sizes. Supports transparency and is handled by every current browser.
Typical use: Website images, product photos, blog media
WebP to JPG converterNext-generation format with the strongest compression of the group. Encoding support depends on the browser, so KuConvert checks availability before offering it.
Typical use: Performance-critical websites, large photo libraries
AVIF to JPG converterLegacy animated format limited to 256 colours. KuConvert reads GIFs and converts the first frame — animation is not preserved.
Typical use: Short loops, legacy web graphics
GIF to PNG converterUncompressed Windows bitmap. Very large files, so converting to WebP or JPG usually produces a dramatic size reduction.
Typical use: Legacy Windows software exports
BMP to JPG converterHigh-fidelity format used in print and scanning workflows. Browser decoding is inconsistent — Safari handles TIFF, most others do not.
Typical use: Scanning, print production, archives
TIFF to JPG converterVector format that scales to any size. Because SVG can carry scripts and external references, KuConvert sanitises the markup before rasterising it.
Typical use: Icons, logos, diagrams, illustrations
SVG to PNG converterThe difference
Most free converters are a web form in front of somebody else’s server. That single architectural choice explains almost every difference below.
| KuConvert | Typical online converter | |
|---|---|---|
| Where images are processed | On your device | Uploaded to a server |
| Account required | Never | Often, for the useful limits |
| Images per batch | 50 | Commonly 1–5 before paying |
| Watermarks | None | Sometimes on free tiers |
| Ads and ad-tech | None — analytics only | Usually how it is funded |
| Files kept after conversion | Nothing to keep | Held, then deleted on a timer |
| Works offline once loaded | Yes | No — the server does the work |
| Very large or exotic formats | Limited by your browser | Server codecs handle more |
The right-hand column describes how upload-based converters generally work; individual services differ, and some are excellent. The last row is the honest trade-off of doing this in a browser — a server with dedicated codecs will always handle more obscure formats than your browser does.
Why KuConvert
Most online converters are an upload form wrapped in advertising. This one is an application that happens to have a landing page around it.
Conversion runs in Web Workers with a small pool of parallel jobs, so the page stays responsive even part-way through a large batch.
Images are decoded, transformed and encoded on your device. Nothing about the image contents is sent anywhere.
Queue up to 50 images, convert them in one pass, and take the results as a single ZIP.
Quality, output size and transparency handling are all adjustable, and hidden behind an advanced panel until you want them.
The core converter is free with no account, no watermark, no file-count paywall and no email step.
Privacy
KuConvert is built around browser-first processing. Your images are converted directly on your device instead of being uploaded to a processing server.
For completeness: like any website, the server that delivers this page records ordinary web request data such as your IP address and browser version. That is described in full in the privacy policy. It never includes your images.
No upload. No server round-trip. No copy left behind.
Examples
Three single images, measured with the default settings. Your own results are shown for every batch you convert.
These are individual measurements, not a guarantee. How much an image shrinks depends on its content, dimensions, source format and the quality setting you choose — and some already-optimised images get slightly larger, which the converter reports honestly when it happens.
FAQ
Everything people usually want to know before converting a batch.
Yes. Converting images is free, with no account, no watermark and no cap on how many batches you run. There is no trial that expires and no upsell in the middle of a conversion.
Because conversion happens on your own device, running it costs us nothing per image, which is what makes a genuinely free tier possible.
Up to 50 images per batch, at up to 25 MB each. When a batch finishes you can immediately start another one.
The limit exists because the work happens in your browser: beyond roughly this many full-resolution images, memory pressure starts to affect mid-range phones.
No. There is no sign-up, no login and no email step anywhere in the workflow. Open the page, drop your images in, and convert.
No. There is no upload endpoint to send them to. Your browser downloads the page once, and from then on every step - reading the file, decoding it, resizing it and encoding the new format - runs on your device using the image codecs your browser already includes.
Google Analytics records which pages and features are used; it never receives your images, because they never leave your device for it to send. A Content Security Policy names every origin the page may contact, and no upload destination is among them. The server keeps ordinary web request logs, which never contain your images.
You can convert to WebP, JPG, PNG and AVIF. AVIF is offered only when your browser can actually encode it, which is checked when the page loads.
As input, anything your browser can decode works: JPG, PNG, WebP, AVIF, GIF, BMP, SVG, and TIFF in browsers that support it. Files are identified by their actual byte signature rather than their extension.
Yes, that is the point of the tool. Drop in up to 50 images and they are processed as one batch, with a small pool of parallel workers so the page stays responsive throughout.
Each image reports its own progress, and if one file fails the rest of the batch continues.
Yes. When a batch of more than one image finishes, the download button produces a single ZIP archive built in your browser. Individual files can also be downloaded one at a time from the queue.
That depends on the format you choose. WebP, JPG and AVIF are lossy formats, and the quality slider controls the trade-off directly - 88 is a good default that is visually hard to distinguish from the original. PNG is lossless, so the slider does not apply.
Converting between two lossy formats always means a second compression pass, so start from the highest-quality source you have when it matters.
No. Re-encoding rebuilds the image from its pixels, so camera settings, timestamps and GPS coordinates are not carried into the converted file. For most people sharing images online this is a privacy improvement rather than a loss.
If you need the metadata, keep your original file - the converter never modifies or deletes it.
No. Animated GIFs are converted using their first frame only, and the result is a still image. Animated output is not supported yet.
KuConvert is a free image converter that runs in your web browser. It converts single images or batches of up to 50 files between the formats the modern web actually uses: JPG, PNG, WebP and AVIF, with GIF, BMP, TIFF and SVG accepted as sources. There is nothing to install, no account to create, and no queue to wait in.
Most online image converters work by uploading your files to a server, converting them there, and giving you a link to download the result. That model means your images sit on somebody else’s machine, at least temporarily. KuConvert takes the other approach: the conversion engine is downloaded to your browser once, and every image is processed on your own device.
For images that will be published on a website, WebP is the sensible default. It is smaller than both JPG and PNG at comparable quality, supports transparency, and is decoded by every current browser. AVIF compresses even harder and is worth using when page weight really matters, though encoding takes longer and browser support for creating AVIF files is less consistent.
JPG remains the right answer when a file has to be opened by unfamiliar software, sent to a printer, or accepted by an older upload form. PNG is the format to choose when you need lossless quality or a transparent background — logos, icons, screenshots and anything headed back into a design tool.
Converting one image at a time stops being reasonable somewhere around the fifth file. A bulk image converter turns a repetitive job into a single operation: add every file, pick one output format, convert, and download the whole set as a ZIP archive. KuConvert processes a batch through a small pool of Web Workers, so the interface stays responsive and each image reports its own progress and its own result.
If one file in a batch cannot be converted — a corrupted image, a format your browser cannot decode, or a file that is simply too large — that file is marked as failed with a specific reason, and the rest of the batch continues. Failed files can be retried without re-adding everything.
WebP, JPG and AVIF are lossy formats: they achieve their small file sizes by discarding information the eye is unlikely to miss. The quality slider controls that trade-off directly. A value around 85 to 90 is usually indistinguishable from the original at normal viewing sizes while producing a much smaller file. PNG is lossless and ignores the setting entirely.
Because conversion re-encodes the image from its pixels, metadata such as EXIF camera settings, timestamps and GPS coordinates does not survive the process. For images that are about to be posted publicly, that is usually the outcome you want. Your original files are never modified, so anything you need is still there.
Each of these has its own page with the converter pre-configured and an explanation of when the conversion makes sense:
Who builds these
KuConvert is built by KUDUY, a web design and development agency. From custom WordPress builds to SEO and e-commerce, everything they do is engineered to bring you more qualified traffic and turn it into revenue.
Custom, conversion-focused web design that captivates visitors and turns them into paying customers. Mobile-first, fast, and built to rank.
Custom WordPress websites built with clean code, blazing-fast performance (Core Web Vitals optimised), and enterprise-grade security.
Online stores that convert visitors to customers with seamless shopping experiences.
Technical SEO, keyword research, on-page optimisation and local SEO strategies that drive qualified organic traffic.
Data-driven campaigns that deliver measurable ROI across every channel.
Memorable brand identities that stand out in any market and build lasting trust.
One-on-one expert support for bug fixes, updates and ongoing maintenance — without a long-term retainer.
Fixed scope, no surprise invoices
Most sites ship in four to eight weeks with the scope and the price agreed up front.
SEO from day one
Search is designed into the build — structure, schema and Core Web Vitals — not retrofitted.
A team, not a ticket queue
A project manager, a designer and a developer you can actually reach.
Up to 50 images. Multiple formats. No account required.
