✦ 100% free · no signup

Free Online File Converter

Merge and sign PDFs, convert images and PDFs in seconds. Everything runs right in your browser, so your files never leave your device. No signup, no watermarks.

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Our tools

Pick a Tool & Get Started

Free file converters, PDF tools and everyday calculators, grouped by category. New tools are added every week, so look for the New tag.

Newly Added 6

PDF Tools 6

Image Converters 8

Image Tools 2

Everyday Tools 8

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Popular conversions

What Do You Want to Convert?

Jump straight to the most-searched conversions. Each one runs privately in your browser.

Merge PDF files Sign a PDF Save a PDF as JPG Convert image to PDF Convert PNG to JPG Convert PNG to PDF Combine JPG to PDF HEIC to JPG (iPhone photos) WebP to PNG Compress images Resize images Make a favicon (PNG to ICO) Convert images to different formats at once Roman numeral converter Military time converter Celsius to Fahrenheit
Why K4Converter

Built to Be Fast, Free & Private

No uploads, no waiting in queues, no watermarks. Just open a tool and convert.

Private by Design

Files are processed on your device. Nothing is uploaded or stored on our servers.

Lightning Fast

No upload or download wait — conversions finish in a blink, even in batches.

Free Forever

No signup, no limits on file count and no watermarks on your results.

Works Everywhere

Desktop, tablet or phone — Windows, Mac, iPhone, Android and Chromebook.

How it works

Convert in 3 Easy Steps

Choose a tool

Pick the converter you need from the list above or the menu.

Add your files

Drag & drop or select files. Add one or many at the same time.

Download

Click convert, then download files one by one or as a single ZIP.

FAQ

Frequently Asked Questions

Is K4Converter really free?

Yes. Every tool is completely free to use with no signup, no daily limits and no watermarks. The site is supported by non-intrusive ads.

Are my files uploaded to a server?

No. Our converters run entirely in your web browser using modern web technology, so your files never leave your device.

Do the tools work on iPhone and Android?

Yes. K4Converter is fully responsive and works in Safari, Chrome, Edge and Firefox on phones, tablets and computers.

Can I convert multiple files at once?

Yes. Most tools support batch conversion — add as many files as you like and download them all together as a ZIP file.

Is K4Converter safe to use?

Yes. Every K4Converter tool runs inside your own web browser, so your files are never uploaded to a server. The site never asks you to download or install anything (no .exe or .msi files, no browser extensions), never asks you to sign up or log in, and never asks for payment details. You can check this yourself: open your browser’s developer tools, go to the Network tab and convert a file — no file is uploaded. K4Converter is built and run by Prakhar Singh, a software engineer from India, since October 2026. The k4converter.com domain was used by an unrelated website until April 2026; that site’s old pages (such as /login or /tools/…) no longer exist.

Who owns and made K4Converter?

K4Converter was created and is run by Prakhar Singh, a software engineer from India. He built it in 2026 to offer free file and PDF tools that work entirely in the browser, so files are never uploaded. You can reach him through the contact page.

What can I convert with K4Converter?

PDFs (merge, sign, PDF to JPG, images to PDF), images (PNG, JPG, WebP, HEIC, JFIF, SVG and ICO), image compression and resizing, plus everyday tools: a tip calculator, a discount calculator, and converters for Roman numerals, military time and temperature.

Ready to Convert Your First File?

Start with our most popular tool — convert PNG images to JPG, WebP or PDF in seconds.

Open PNG Converter →