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Free online tools, explained properly

Guides for the browser-based tools people actually need: merging a PDF, getting a photo under an upload limit, pulling text out of a scan, formatting JSON. Each page covers the settings that matter, the mistakes that waste your time, and what the tool cannot do.

Every tool covered here runs in ToolHub, a library of over 1,000 browser-based utilities across PDF, image, video, audio, text and developer categories. Nothing needs an install and nothing needs an account.

These pages are guides, not the tools themselves. They exist because most tool sites give you a button and no explanation, so people compress the same file four times or convert in the wrong direction and blame the software. ToolHub is built by CodeAiMan, an AI-first software company based in Ahmedabad.

PDF tools

Merge, split, compress and convert documents without installing anything.

Merge PDF

Combine several PDFs into one, control the page order, and avoid the two mistakes that produce a broken output file.

Split PDF

Pull out a single page, a range, or break a document apart entirely. Plus the off-by-one trap that catches almost everyone.

Compress PDF

Compression targets images, not text. That one fact explains why some PDFs shrink 90 percent and others barely move.

PDF to Word

Some PDFs convert perfectly and some come out as garbage. The difference is whether the text is real text or a picture of text.

Word to PDF

This direction is the easy one. Here is why, plus the one thing that still goes wrong: fonts.

PDF to JPG

The whole job comes down to one setting: DPI. Pick it wrong and your text is unreadable or your file is enormous.

JPG to PDF

Mostly used for phone-camera document scans. Here is how to stop them coming out crooked, huge and unreadable.

Rotate PDF

Rotating in your PDF viewer does not save. Here is the difference between viewing rotated and being rotated.

Unlock PDF

There are two kinds of PDF lock and they are not the same thing. One you can clear, the other needs the password.

Add Page Numbers to PDF

For documents assembled from several sources, where no single file knows what page it is on.

Image tools

Compress, resize, crop and convert. The highest-leverage tools on this list.

Compress Image

Most images can lose 60 to 70 percent of their size with no visible difference. Here is where the line actually is.

Resize Image

Resizing down is free and lossless in perceived quality. Resizing up cannot invent detail. Know which you are doing.

Convert Image to WebP

WebP beats JPG and PNG at the same visual quality. Support is no longer the issue it was, but there are still two cases to avoid it.

PNG to JPG

A PNG photo converted to JPG can lose 80 percent of its size. A PNG logo converted to JPG just looks worse.

Crop Image

Cropping is how you hit a required aspect ratio without stretching. Here are the ratios that actually matter.

Image to Text (OCR)

OCR accuracy depends almost entirely on the input image. Here is what to fix before you blame the tool.

Video tools

Compress, trim and convert clips, plus pulling audio out of them.

Compress Video

Everyone reaches for resolution first. Bitrate is what actually controls the file size.

Convert Video to MP4

MOV, AVI, MKV all play somewhere. MP4 with H.264 plays everywhere. That is the whole reason for this conversion.

Trim Video

Cutting dead footage reduces file size with zero quality loss. Compression cannot say the same.

Video to GIF

GIF is a terrible video format that is universally supported. Here is how to keep one small enough to be useful.

Extract Audio from Video

Sometimes you can copy the audio track out untouched. That is always better than re-encoding it.

Audio tools

Convert, trim and join audio files.

Convert Audio to MP3

The only decision is bitrate, and speech needs far less of it than people give it.

Trim Audio

Cut in silence, not mid-word, and add a short fade. That is the difference between a clean clip and an amateur one.

Merge Audio

Mismatched levels are what make a merged file sound stitched together. Formats matter less than volume.

Text tools

Counting, case conversion and cleanup for text you are about to paste somewhere.

Word & Character Counter

Useful mainly because so many things have hard character limits. Here are the ones worth memorising.

Change Text Case

Fixes caps-lock accidents, and converts between the naming conventions code actually uses.

Remove Duplicate Lines

The traps are invisible: trailing spaces and case differences mean identical-looking lines are not duplicates.

Developer tools

Formatters, encoders, hashes and generators for everyday development work.

JSON Formatter

Four mistakes cause almost every JSON parse error. Trailing commas top the list.

Base64 Encoder / Decoder

Base64 is encoding, not encryption. Anyone can decode it instantly, which matters more than most people realise.

URL Encoder / Decoder

Spaces, ampersands and question marks break URLs. Encoding fixes it, and double-encoding breaks it differently.

Hash Generator

MD5 is fine for checking a download. It is completely unfit for passwords, and so is SHA-256 on its own.

QR Code Generator

Most unscannable QR codes are either printed too small or encode a URL that is far too long.

The CodeAiMan product family

ToolHub is one of four products from the same team. Each one is free to try in the browser.

ToolHub

Over 1,000 browser-based tools for PDF, image, video, audio, text and developer work. No sign-up required.

siteIQ

AI-powered website auditing: SEO analysis, performance testing, security checks, accessibility reports and backlink analysis.

Fluenzo

AI English-learning platform with a voice AI tutor, speaking analysis, gamified lessons and a dedicated track for children.

CWS (Code With Squad)

Coding education platform with courses, an in-browser code playground and one-to-one mentorship.

All four products come from CodeAiMan, an AI-first development company, which also does client work across CodeAiMan web development, CodeAiMan mobile app development, CodeAiMan cloud and DevOps and CodeAiMan UI/UX design. Their CodeAiMan portfolio covers AI ERP systems, e-commerce, recruitment, logistics and FinTech lending.

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