Office & Study Tools
64 tools in total
Random Phone Number Generator
A free online random phone number generator supporting many countries and regions. Generate virtual numbers in realistic formats in bulk and export the results to Excel or TXT.
Office & Study 192.6k uses
Online Word Count
An online word count tool that shows characters, words, Chinese characters, lines, paragraphs and sentences in real time, and estimates reading time. A must-have before writing copy or checking a thesis.
Office & Study 25.1k uses
Text Diff Tool
A free online text diff tool that compares two texts line by line and highlights additions and deletions. It supports ignoring case and leading/trailing whitespace, ideal for version proofreading and copy revision.
Office & Study 18k uses
Text Case Converter
An online text case converter that switches between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case and kebab-case with one click. A handy tool for writing and programming.
Office & Study 14k uses
Lorem Ipsum Generator
A free online Lorem Ipsum placeholder text generator. Customize the number of paragraphs and sentences per paragraph, generate dummy text for layout mockups in one click, and copy or clear it easily — ideal for design and front-end work.
Office & Study 13.1k uses
PDF to Image
Convert PDF pages to high-quality images in your browser. Render each page to PNG or JPEG, set the scale and page range, then download them all.
Office & Study 48 uses
Certificate Generator
Online certificate generator: customize the title, recipient and date to create a printable award certificate, all processed locally in your browser without uploading.
Office & Study 47 uses
HTML to Markdown
An online HTML to Markdown converter: paste your HTML source and get clean Markdown text instantly. It handles headings, lists, links, images, tables and code blocks, making content migration easy.
Office & Study 47 uses
PDF Image Extractor
Recover the embedded images hidden inside a PDF right in your browser. Browse thumbnails across all pages and download each image as PNG, or grab them all at once — no upload required.
Office & Study 47 uses
PDF Poster Tile Print
Online PDF poster tiler: enlarge a single page into a large poster split across multiple sheets of paper and add crop marks for printing and mounting. Processed locally.
Office & Study 44 uses
PDF N-up Layout
Online PDF N-up layout tool: arrange a multi-page PDF as 2/4/6/9 pages per sheet to save paper when printing. Processed locally, no upload.
Office & Study 44 uses
Resume Builder
Build a clean, professional resume in your browser with live preview. Fill in your details, experience, education and skills, then export or print as PDF.
Office & Study 44 uses
PDF Encryption Info Detector
Online PDF encryption info detector: check whether a PDF is encrypted, its encryption algorithm and permission restrictions, and view copyable details. Parsed locally, no upload.
Office & Study 43 uses
Markdown to HTML
An online Markdown to HTML converter: paste Markdown to generate the matching HTML code with live preview. It supports headings, lists, quotes, tables and code blocks — handy for blogs and documentation.
Office & Study 42 uses
PDF Merge
Merge multiple PDF files into one document right in your browser. Reorder the files and pages, then combine and download—nothing gets uploaded.
Office & Study 42 uses
Chinese Simplified / Traditional Converter
A free online Chinese converter that switches between Simplified and Traditional Chinese in both directions using phrase-based rules for common words — useful for copywriting and cross-region communication.
Office & Study 41 uses
Markdown Table Generator
Online Markdown table generator: add or remove rows and columns visually, fill in the cells, and get standard Markdown table text in real time. Set per-column alignment and copy the result with one click — handy for writing docs and README files.
Office & Study 41 uses
PDF to Text
Pull the text out of any PDF in seconds, right in your browser. Each page is shown separately with one-click copy, plus copy-all and a .txt download — nothing is ever uploaded.
Office & Study 41 uses
Random Picker & Grouping
An online random picker and grouping tool that can randomly pick one person from a list, shuffle the order, or evenly divide people into several groups. A must-have for classroom roll calls, activity lucky draws and team grouping.
Office & Study 40 uses
Text Sort & Dedupe
An online text deduplication and sorting tool supporting line-by-line deduplication, ascending or descending sort, and removal of empty lines and leading/trailing spaces, with real-time counts of lines and characters. Commonly used for list cleanup and data cleaning.
Office & Study 40 uses
Receipt Generator
Online receipt generator: enter amounts, line items and payment details to create a printable receipt, all processed locally in your browser without uploading.
Office & Study 40 uses
One-Click Text Cleaner
An online text cleaner that removes extra spaces, blank lines, line breaks and tabs in one click. You can also strip HTML tags, quotes and invisible characters, and normalize line endings and case — perfect for tidying copy and cleaning data.
Office & Study 40 uses
Markdown to PDF
Convert Markdown into a clean, well-formatted PDF in your browser. Type or paste your text, preview the result live, then export or print it as a PDF.
Office & Study 40 uses
PDF Metadata Cleaner
View and erase PDF metadata such as author, title and software, along with hidden information, in your browser. Runs locally, never uploaded.
Office & Study 39 uses
Invoice Generator
Create a professional invoice or receipt in your browser. Add line items and taxes with automatic totals, then export or print it as a PDF in seconds.
Office & Study 39 uses
Matrix Calculator
Add, subtract and multiply matrices, or compute the transpose, determinant and inverse. Supports 2×2 to 4×4 matrices with results shown in a clean grid.
Office & Study 39 uses
Time Duration Calculator
A free online time duration calculator: add or subtract days, hours, minutes and seconds from a given time, or calculate the interval between two times. Handy for meeting scheduling and countdown planning.
Office & Study 38 uses
CSV Viewer
Online CSV viewer and converter: paste or upload CSV data to view it as a table, with support for custom delimiters. Export the result as JSON, Markdown or an HTML table — great for previewing and cleaning up data.
Office & Study 38 uses
Batch Find and Replace
An online batch find and replace tool that supports both plain text and regular expressions. You can match case, run multiple rules in sequence, and see how many replacements each step made — great for batch text processing and data cleaning.
Office & Study 38 uses
Time Zone Meeting Converter
A free online time zone converter for meetings: pick a time and see the matching local time and day/night status for multiple cities and time zones on one screen. Essential for cross-border collaboration and remote meetings.
Office & Study 37 uses
Bank Card Number Validator
A free online bank card number validator that checks whether a card number is valid using the Luhn algorithm and identifies the brand and card type. Useful for data entry verification and payment development.
Office & Study 37 uses
Simple Expense Tracker
A free online expense tracker: record income and expenses by date, get an automatic balance and organise entries by category with notes. Data is stored locally in your browser — a handy tool for daily bookkeeping and budgeting.
Office & Study 37 uses
PDF Form Flattener
Turn fillable PDF forms into static content in your browser so the fields can no longer be edited, while keeping the original layout. Runs locally, never uploaded.
Office & Study 37 uses
PDF Page Crop
Online PDF page cropper: set margins or a crop box visually to batch-crop PDF pages and remove white borders. Processed locally, no upload.
Office & Study 37 uses
PDF Compressor
Resave and streamline a PDF's structure to reduce its file size, with an option to strip metadata. Runs locally in your browser, never uploaded.
Office & Study 37 uses
Business Card Maker
Online business card maker: fill in your name, job title and contact details to generate a printable card, all processed locally in your browser without uploading.
Office & Study 37 uses
PDF Split
Split a PDF into separate files or extract specific pages in your browser. Split every N pages or pick a range, then download the results.
Office & Study 37 uses
Date Calculator
A free online date calculator: find the number of days between two dates, or add and subtract days, weeks, months or years from a given date and see the resulting weekday. Ideal for scheduling and anniversary planning.
Office & Study 36 uses
PDF Form Data Import/Export
Export PDF form fields to JSON or batch-fill them from JSON in your browser. Runs locally, never uploaded.
Office & Study 36 uses
PDF Signature Tool
Sign a PDF in your browser by drawing a handwritten signature or uploading a signature image, then drag it to the desired spot. Runs locally, never uploaded.
Office & Study 36 uses
Extract PDF Pages
Pull specific pages from a PDF by page number or range, or invert your selection, to build a new document. Runs locally in your browser, never uploaded.
Office & Study 36 uses
Fill PDF Forms
Detect the fields in a fillable PDF, fill them in and export the completed file, optionally flattening the form. Runs locally in your browser, never uploaded.
Office & Study 36 uses
PDF Header & Footer
Add custom header and footer text to every page of a PDF, including page numbers and total pages. Runs locally in your browser, never uploaded.
Office & Study 36 uses
PDF Resize
Online PDF resize tool: scale or fit every page to A4, Letter or a custom paper size, all processed locally in your browser without uploading.
Office & Study 36 uses
PDF Stamp & Watermark
Online PDF stamp tool: add text or image watermarks and stamps at a specified position on pages, all processed locally in your browser without uploading.
Office & Study 36 uses
RSS/Atom Generator
Generate standards-compliant RSS and Atom feeds online. Enter your site details and a list of articles, set the title, link, publish time and summary, then copy or download the XML in one click. A handy tool for blogs and content distribution.
Office & Study 36 uses
Statistics Calculator
Paste a list of numbers to compute count, sum, mean, median, mode, range, quartiles, IQR, variance and standard deviation. Copy the result in one click.
Office & Study 36 uses
Prime Factorization
Factor any positive integer into primes and see the factorisation formula, prime list, divisor count and sum, and a prime check. Show all divisors.
Office & Study 36 uses
PDF Rotate
Rotate the pages of any PDF directly in your browser. Choose all pages or a custom range, pick 90°, 180° or 270°, and download the fixed file — no upload, everything stays on your device.
Office & Study 36 uses
PDF Watermark
Stamp a clean text watermark on every page of your PDF right in the browser. Pick the text, color, opacity, angle and a centered or tiled layout, then download instantly — no upload, no sign-up.
Office & Study 36 uses
RMB Amount in Chinese Uppercase
An online RMB amount to Chinese uppercase converter: enter a numeric amount to get the standard Chinese uppercase form (e.g. 壹仟贰佰叁拾肆元伍角陆分), supporting yuan/jiao/fen and negative numbers. Commonly used for financial reimbursement and filling in contracts.
Office & Study 35 uses
Online To-Do List
A free online to-do list: quickly add tasks, check them off and delete them, set priorities and save everything locally. Your list survives page refreshes and stays only in your browser — simple and efficient.
Office & Study 35 uses
PDF Metadata Editor
Edit a PDF's document properties such as title, author, subject and keywords. Runs locally in your browser, never uploaded.
Office & Study 35 uses
Roman Numeral Converter
An online Roman numeral converter that translates between Arabic numbers and Roman numerals in both directions. It validates input automatically, supports the 1–3999 range, and shows the conversion, making it useful for learning and practice.
Office & Study 35 uses
Delete PDF Pages
Remove unwanted pages from a PDF right in your browser. Enter the pages to delete, see how many will remain, then download the trimmed file — no upload, everything stays on your device.
Office & Study 35 uses
Workday Calculator
A free online workday calculator that counts the number of working days between two dates. It automatically excludes weekends and lets you add custom holidays and make-up workdays — ideal for attendance, project scheduling and leave planning.
Office & Study 34 uses
PDF Redaction Tool
Black out or keyword-locate sensitive text in a PDF in your browser, optionally removing the underlying content to protect privacy. Runs locally.
Office & Study 34 uses
PDF Page Label
Online PDF page label tool: add Bates-style labels to every page with a configurable prefix, start number and format. Ideal for document archiving and citation. Processed locally.
Office & Study 34 uses
Insert Blank Pages into PDF
Insert one or more blank pages at any position in a PDF and set their size and count. Runs locally in your browser, never uploaded.
Office & Study 34 uses
PDF Page Reorder
Online PDF page reorder tool: drag pages to rearrange the order, remove unwanted pages, then export, all processed locally in your browser without uploading.
Office & Study 34 uses
Online Stopwatch
An online stopwatch and timer with start, pause, reset and lap recording. It measures to the millisecond and logs multiple split times, ideal for sports timing, experiments and focus sessions.
Office & Study 34 uses
ASCII Art Text Generator
Turn plain text into stylish ASCII art banners online. Choose from several font styles, adjust the fill character and width, then copy the multi-line result with one click. Great for code comments, terminals and social posts.
Office & Study 34 uses
Add PDF Page Numbers
Insert page numbers into any PDF in your browser. Pick the position, format, starting number, font size, margin and color, then download — no upload, everything stays on your device.
Office & Study 34 uses
Percentage Calculator
An online percentage calculator with several modes: find what a percentage of a number is, what percent one number is of another, and the percentage increase or decrease between two values. It computes instantly as you type and shows the formula used, which is handy for study, shopping, and finance.
Office & Study 33 uses