StudyKit toolkit

Which tool you actually want

Every tool, grouped by the situation you are in rather than by what they are made of. Each entry says what it is for, and where it stops working. The full directory is further down if you would rather scroll.

Start here See the full list

Start from what you have

Most people arrive knowing what is on their screen, not which category it belongs to. Pick the row that matches your situation.

A photo or a scan

Get words out of it

Text from Image pulls typed words out of a picture so you can copy them. It reads clear, straight-on text. Handwriting, a skewed page, or text over a busy background will come back wrong or empty, and it will not tell you which of those happened, so check the result before you rely on it.

A draft that needs measuring

Get numbers before you rewrite

Word Counter counts words, characters, and sentences. Reading Time turns that into minutes at a reading or speaking pace. Keyword Density shows which words a draft leans on, which is the fastest way to notice a paragraph repeating itself. All three are exact counts, not judgements.

Text that came in mangled

Fix the formatting, not the words

Punctuation Fixer repairs doubled spaces and repeated punctuation from a bad copy-paste. Case Converter switches between sentence case, lower case, and capitals. Neither changes what you wrote.

Text you are sending to someone else

Each of these puts something scannable in front of a person with a phone, without asking them to type it.

Sharing a link

URL QR Code

A code for a web address. Text QR Code does the same for any short piece of text. A code that opens a mail app pre-filled comes from Email QR Code, and one that joins a phone to a network comes from Wi-Fi QR Code. Keep the encoded text short: most scanners give up on a long payload.

Reading one back

QR Code Scanner

Points the camera at a code and shows what it holds. A code that will not read is usually too small on screen, too low-contrast, or damaged, and none of those are things the scanner can repair for you.

Sending a document

Word to PDF, or Merge PDF

Word to PDF turns a Word file into a PDF that keeps its layout, and is one of the four that uploads your document to a server to be converted; the upload is deleted as soon as the conversion ends. Merge PDF combines several PDFs into one in the order you set. It does not re-order or re-compress pages inside them, and a Word file with unusual fonts may shift slightly.

A picture that is the wrong shape, size, or kind

The most common job on this site. Start from the problem you are trying to solve, not the file extension.

It is too big

Image Compressor

Reduces a picture for email or the web and shows the saving. For a file that will not upload at all, compress before you resize, since compression alone is often enough.

The platform wants exact pixels

Resize Image, then Aspect Ratio

Resize Image sets a picture to a fixed width and height. Aspect Ratio changes the shape without stretching what is in it. If a platform asks for both, resize first, then check the ratio, so nothing is stretched on the way.

Nothing else will open it

WebP to JPG or PNG

Converts a WebP into a format older software accepts. It does not convert in the other direction, and it will not improve the picture, only the format.

A picture you need to change, or hide something in

These edit pixels. What they cannot do is recover detail that was never in the file.

The background is in the way

Background Remover

Background Remover cuts a subject out and hands back a transparent PNG. It uploads your picture to a server, because telling a subject apart from a background needs a recognition model that will not run usefully in a browser tab, and the upload is deleted as soon as the cut-out is finished. It is a trained guess about what counts as the subject, so check the edges. Hair, reflections, and a subject against a similar colour are where it struggles, and it cannot tell you that it struggled.

Something has to be obscured

Blur & Pixelate, or Redact Image

Blur & Pixelate covers a face, plate, or screen. For anything governed by law or by someone else’s data, Redact Image is the right choice: it also clears the saved location data a photo carries. A blur is still a photograph of the thing you meant to hide, so do not treat it as redaction.

It needs to be visibly yours

Add a Watermark

Puts your own mark across a picture. It sits on top of the image and stays there in anything exported from it.

You need the exact colour

Colour Picker

Reads a colour off a picture and gives hex and RGB values. It samples what is on screen, which on a compressed or rescaled image can be a slightly different value from the original file.

Capturing or editing moving things

Both of these do the heavy work on your own machine rather than uploading anything, which is why a long video or a long recording takes as long as your computer takes.

Something already recorded

Video Auto Clip

Finds the scene changes in a video and cuts it into separate parts joined into one file. It finds cuts, not meaning: a static shot held for a minute gets treated the same as a change worth keeping. It does not look at the words, and it cannot choose a highlight.

You need to record something now

Screenshot, or Screen Recorder

Screenshot captures a tab, a window, or the whole screen as a PNG. Screen Recorder records the screen with an optional microphone. Both ask for permission first, and a browser will only record a tab it is allowed to capture.

A number you can work out yourself

Included because a tool that only does arithmetic is honest about what it is.

Grades

GPA Calculator

A weighted average from your credits and grades, using the scale you enter rather than one imposed on you. Check which scale your institution uses before you quote the number.

Percentages

Percentage Calculator

Percentages, differences, and increases. Useful for the arithmetic after a discount, a mark, or a change between two values.

The full directory

Everything, grouped by category, for when you would rather look than decide.

Text8

Text01

Text Rewriter

Rewrite a paragraph so the wording reads differently without changing the meaning.

Open Text Rewriter

Text02

Prompt Builder

Turn a lazy prompt into a proper brief with a role, context, format and rules, for ChatGPT, Claude, Midjourney or anything else.

Open Prompt Builder

Text03

Writing Pattern Analyser

Measure sentence length variation, vocabulary range, repetition and passive voice in any text.

Open Writing Pattern Analyser

Text04

Invisible Character Cleaner

Find and remove zero-width characters, bidirectional controls and soft hyphens from copied text.

Open Invisible Character Cleaner

Text05

Alphabetical Order Tool

Sort any list of words or names from A to Z or Z to A, in your browser.

Open Alphabetical Order Tool

Text06

Punctuation Fixer

Repair doubled spaces and repeated punctuation in copied text.

Open Punctuation Fixer

Text07

Case Converter

Switch text between sentence case, lower case, and UPPER CASE.

Open Case Converter

Text08

Citation & Bibliography Generator

Format a reference in APA, MLA, Chicago or Harvard, and export it as BibTeX.

Open Citation & Bibliography Generator

Counting & Analysis3

Counting & Analysis09

Word Counter

Count words, characters, sentences, and paragraphs as you type.

Open Word Counter

Counting & Analysis10

Reading Time

Estimate how long a piece of writing takes to read or to say aloud.

Open Reading Time

Counting & Analysis11

Keyword Density

See which words a text leans on most, and how often.

Open Keyword Density

Images11

Images12

Image Compressor

Make a picture smaller for email or the web, and see the saving.

Open Image Compressor

Images13

Text from Image

Pull typed words out of a photo or a scan so you can copy them.

Open Text from Image

Images14

Resize Image

Resize a picture to the sizes social platforms ask for.

Open Resize Image

Images15

Aspect Ratio

Change a picture's shape without stretching it.

Open Aspect Ratio

Images16

WebP to JPG or PNG

Convert a WebP picture into a format everything else accepts.

Open WebP to JPG or PNG

Images17

Blur & Pixelate

Blur a picture to hide a face, a plate number, or a screen.

Open Blur & Pixelate

Images18

Colour Picker

Pick a colour from a picture and get its hex and RGB values.

Open Colour Picker

Images19

Add a Watermark

Put your own mark across a picture to show it is yours.

Open Add a Watermark

Images20

Background Remover

Cut a subject out of a photo and download it with a transparent background.

Open Background Remover

Images21

Redact Image

Cover personal details in a picture and clear its saved location data.

Open Redact Image

Images22

Colour Palette Generator

Pull the colours out of a picture, with the contrast of each pair worked out.

Open Colour Palette Generator

PDF & Documents5

PDF & Documents23

Word to PDF

Turn a Word document into a PDF that keeps the original layout.

Open Word to PDF

PDF & Documents24

Split PDF

Pull pages or page ranges out of a PDF into separate documents, in your browser.

Open Split PDF

PDF & Documents25

Merge PDF

Combine several PDFs into one file, in the order you choose.

Open Merge PDF

PDF & Documents26

PDF Editor

Reorder, rotate, duplicate, or delete pages, then download the file.

Open PDF Editor

PDF & Documents27

PDF to EPUB

Turn a text-based PDF into an EPUB that reflows on an e-reader.

Open PDF to EPUB

QR Codes5

QR Codes28

URL QR Code

Turn a web address into a code anyone with a phone can scan.

Open URL QR Code

QR Codes29

Text QR Code

Put any short piece of text into a scannable code.

Open Text QR Code

QR Codes30

Email QR Code

Make a code that opens a new message to an address.

Open Email QR Code

QR Codes31

Wi-Fi QR Code

Make a code that joins someone to a network without typing it.

Open Wi-Fi QR Code

QR Codes32

QR Code Scanner

Read a code with the camera and see what it holds.

Open QR Code Scanner

Calculators2

Calculators33

GPA Calculator

Work out a weighted grade point average from credits and grades.

Open GPA Calculator

Calculators34

Percentage Calculator

Work out percentages, differences, and increases.

Open Percentage Calculator

Capture & Record2

Capture & Record35

Screenshot

Capture a tab, a window, a screen, or a selected area as a PNG.

Open Screenshot

Capture & Record36

Screen Recorder

Record the screen, with an optional microphone, in your browser.

Open Screen Recorder

Video1

Video37

Video Auto Clip

Find the interesting parts of a video and cut them into separate clips.

Open Video Auto Clip

Study & Recall5

Study & Recall38

Study Planner

Turn subjects and an exam date into a revision timetable that spreads each subject across the weeks you have.

Open Study Planner

Study & Recall39

Cornell Notes Generator

Lay notes out on the Cornell pattern with a cue column and a summary band, ready to print.

Open Cornell Notes Generator

Study & Recall40

Quiz Generator

Turn notes into a self-marking quiz, or print an answer sheet to write on.

Open Quiz Generator

Study & Recall41

Study Guide Builder

Turn a passage into named guide sections with a check question each, using a model that runs on this server.

Open Study Guide Builder

Study & Recall42

Flashcards

Make flashcards from your notes and study them with active recall.

Open Flashcards

Audio1

Audio43

Audio Compressor

Shrink an audio file to MP3, AAC, Opus or FLAC at a bitrate you pick, in seconds.

Open Audio Compressor

Trading practice1

Trading practice44

Crypto Chart Simulator

Practise reading live crypto charts, or replay history candle by candle, with a simulated balance.

Open Crypto Chart Simulator

Use the results responsibly

These tools support editing, document conversion, image preparation, screenshots, study, and quick calculations. They cannot verify facts, citations, or the accuracy of a result, and a rewrite does not guarantee originality or academic compliance.

Read the Privacy Policy for information about browser processing and technical logs. Do not enter information you are not authorized to share.