Practical how-to articles for image compression, PDF management, AI writing, and developer utilities — written by the ToolsGravity team.
Author in Markdown or HTML and export a polished PDF with real browser rendering, then convert fixed PDFs into reflowable ePub or one continuous scrolling page for comfortable reading.
Remove blank pages, split one scan into separate documents at divider sheets, extract individual photos, and auto-rename files so a folder of scan_001.pdf becomes something you can search.
Beat email attachment limits by compressing before splitting, break long documents into per-chapter files named after their bookmarks, and add an outline when your PDF has none.
PDFs can carry JavaScript that runs on open and files most viewers never show you. How to inspect a document before you trust it, sanitize what looks wrong, and use attachments safely yourself.
Five one-click photo fixes — brighten a flat image, un-mirror a selfie, invert film negatives, tint a mismatched set, and pixelate for a retro look. Free, full quality, no watermark.
Why your logo gets a white box, why the converted file is bigger, and why iPhone photos won’t open on Windows. A practical guide to converting between PNG, JPG, WebP and HEIC.
Enlarge small photos without the blur, crop to any aspect ratio without cutting off heads, and check the GPS and camera data hidden in your images before you publish them.
Four smart workspaces that replace a drawer of single-purpose tools — describe what you want and AI does the routing. A tour of AI Text, Dev, Image, and PDF Studio, free in your browser.
Stop re-searching the same things — convert chmod permissions, look up HTTP status and MIME types, generate a .gitignore or bcrypt hash, and check WCAG contrast. Free browser dev utilities.
The small text jobs done instantly — bulk find & replace, add line numbers, strip invisible characters, count word frequency, and generate placeholder, fancy, or ASCII text. Free in your browser.
Draft faster with AI headlines, meta descriptions, tone changes, and translation — then check readability and keyword focus before you publish. The free browser toolkit for content that ranks.
Open iPhone HEIC photos anywhere, shrink images with WebP, or add transparency with PNG. A one-click guide to converting between every common image format, free and in your browser.
Rotate a sideways page, invert colours for night reading, strip images, remove pages, or inspect a file’s properties and scripts. A roundup of the handy, lesser-known free PDF tools.
Set CSS box-shadow, border-radius, and easing curves visually, then clean up messy code and convert between JSON, YAML, and XML. The free browser toolkit for front-end and config chores.
Print smarter — multiple pages per sheet, a folded booklet, a tiled poster, or a new paper size. A guide to the free PDF print-layout tools, all in your browser.
Add an APPROVED stamp, a logo, letterhead, or a repeated header to a PDF without rebuilding it. A guide to the free PDF stamp, image, and overlay tools, in your browser.
Unlock a form that won’t let you type, pull the answers out as data, and flatten a completed form so it can’t be changed. The complete free PDF-forms workflow, in your browser.
Turn images, Word, HTML, and Markdown into a PDF — and convert a PDF back to Word, PowerPoint, images, HTML, Markdown, or EPUB. A guide to every free PDF conversion tool, in your browser.
Password-protect, redact, and sanitize a PDF before you send it. A practical guide to locking down access, permanently removing sensitive text, and stripping hidden metadata — in your browser.
Low-light photos come out grainy. Denoising smooths the grain while keeping detail. Learn where noise comes from, the strength trade-off, and how to clean up photos free in your browser.
Generate TypeScript interfaces from a JSON API response for autocomplete and compile-time safety — no hand-typing. Learn how, with examples, free in your browser.
Break a big PDF into chapters, split by file size for email, extract a range, reorder pages, or drop blank scanner pages. A guide to the free PDF split & organize tools in your browser.
The everyday image jobs — resize to exact pixels, smart-crop, rotate, flip, and add a border. A guide to the free image transform tools, all in your browser.
A cron expression schedules recurring jobs in five fields. Learn what each field means, decode common expressions like 0 9 * * 1, and build your own free in your browser.
Programmers move between number systems constantly — decimal, binary, hex, octal. Learn where each is used and convert between all four instantly, free in your browser.
Turn a JSON array of objects into a clean CSV table for Excel, Sheets, and imports — one row per object. Learn what converts cleanly, with examples, free in your browser.
Text copied from PDFs, emails, and web pages arrives messy. A rundown of free one-click tools to remove extra spaces, duplicate lines, line breaks, accents, and HTML — in your browser.
Write in Markdown, publish in HTML. Learn what converts, how to turn Markdown into clean semantic HTML (and back), with examples — free and live in your browser.
A UUID is a 128-bit unique identifier for database keys, request IDs, and more. Learn what UUIDs are, the versions (v4/v1/v5), when to use them, and how to generate them free online.
A rundown of free one-click photo effect tools — blur, sharpen, grayscale, sepia, invert, tint, vignette, and pixelate — and exactly when to reach for each, in your browser.
A slug is the readable part of a URL. Learn what makes a good slug — lowercase, hyphenated, keyword-first — and turn titles into clean, SEO-friendly slugs free in your browser.
Turn CSV data into a clean Markdown table for READMEs, docs, and GitHub issues — quotes, commas, and alignment handled. Learn how, with examples, free in your browser.
An app or PWA needs its icon in dozens of sizes across iOS, Android, and the web. Learn what each platform requires and generate the whole set from one image, free online.
Dull, flat, or slightly dark photo? Auto-enhance fixes exposure, contrast, and colour in one click. Learn what it adjusts, when to use it, and how — free in your browser.
Crop any photo into a clean circle with transparent corners for Slack, Discord, forums, and team pages. Learn the framing and PNG tips, free in your browser.
The favicon is the tiny icon in every browser tab. Learn the sizes you need, how to make one from any image, and design tips so it reads at 16px — free in your browser.
Your photos carry hidden GPS location, date, and device data — sharing one can leak your home address. Learn how to strip EXIF metadata before you share, free in your browser.
Protect your photos from theft and credit your work with a text or logo watermark. Learn the best placement and opacity, plus how to watermark a photo free in your browser.
Pull the original photos, charts, and logos out of a PDF at full quality — far better than a screenshot. Learn extract-images vs page-to-image, plus tips, free in your browser.
Turn a PDF into web-native content — reflowing text, real headings, and exported images — for publishing online and better SEO. Learn what converts cleanly, free in your browser.
Flattening merges form fields, signatures, and annotations permanently into the page so they can’t be edited or reset. Learn when and how to flatten a PDF free in your browser.
Need just a few pages from a big PDF? Learn how to extract a page range into a clean new file — and when to extract vs split vs delete pages — free in your browser.
Cut wasted white borders from scanned pages and slide exports so your content fills the page. Learn crop vs resize, common scenarios, and how to crop a PDF free online.
PDF/A is the archival PDF standard — self-contained and guaranteed to render decades from now. Learn who needs it, the conformance levels, and how to convert free online.
Turn a PDF slide deck back into editable PowerPoint slides. See what converts cleanly, what needs cleanup, and how to convert PDF to PPTX free in your browser.
Drawing a black box leaves the text underneath fully recoverable. Learn how to properly redact a PDF — permanently removing sensitive data — plus what to redact and why.
A “file is damaged” error isn’t always the end. Learn why PDFs corrupt, what a repair tool can recover, and how to fix a broken PDF free in your browser.
Merged and scanned PDFs often have no page numbers. Learn how to add clean, sequential page numbers — with the right position, format, and start page — free in your browser.
Stamp CONFIDENTIAL, DRAFT, or your logo across every page of a PDF. A practical guide to text vs image watermarks, the best opacity and angle, and doing it free in your browser.
A scanned PDF is just images — you can’t search or copy the text. OCR adds a searchable text layer. Learn how to OCR a PDF free in your browser, plus accuracy tips.
QR codes can encode URLs, contact cards, WiFi credentials, and more. A complete guide to generating customised QR codes with brand colours and logos, including error correction and scanning tips.
Weak and reused passwords cause the majority of account breaches. Learn what makes a password truly secure, how long it would take to crack yours, and how to generate unguessable passwords free.
Emojis cause database encoding errors, look unprofessional in formal documents, and break text analysis pipelines. Learn why they cause problems and how to strip them completely in one click.
Base64 appears in JWTs, email attachments, data URIs, and Basic Auth headers. A clear explanation of what it does, why it exists, and how to encode and decode Base64 free in your browser.
AI speech-to-text transcription converts audio recordings to accurate text in seconds. A complete guide covering accuracy expectations by audio type, tips for better results, and common use cases.
Spaces, special characters, and non-ASCII text in URLs must be percent-encoded. A developer-friendly guide to why URL encoding exists, when you need it, and common mistakes to avoid.
Neural TTS voices are now nearly indistinguishable from human speech. Learn how text-to-speech works, what it is useful for, and how to produce natural-sounding audio narration for free.
JWT tokens are everywhere in modern authentication but opaque to the eye. Learn the JWT structure, what every standard claim means, and how to decode any token instantly in your browser.
Lorem ipsum has been the designer's placeholder text since the 1960s. Learn its 2,000-year history, why it works better than real text in mockups, and how to generate any amount instantly.
Regular expressions are one of the most transferable skills in programming. A beginner-friendly guide covering all core syntax with practical examples and tips for using a visual regex tester.
Raw JSON is unreadable; invalid JSON causes silent failures. Learn to format, validate, and debug JSON with explanations of every common JSON error and how to fix them.
CSS gradients add visual depth and interest without image files. A complete guide to linear, radial, and conic gradients with a syntax reference table and design pattern suggestions.
Markdown is the standard format for documentation, READMEs, and blog posts across the modern web. A complete beginner's guide covering all core syntax with before/after examples.
Colour values appear in different formats across design tools, CSS, and print production. A clear comparison of every colour format with use cases and a guide to converting between them.
A visual text diff tool highlights additions, deletions, and unchanged content between two versions of a document. Learn when to use word-level vs line-level comparison and tips for accurate results.
Unix timestamps are the universal time format in computing — databases, APIs, and log files all use them. Learn what they are, the seconds vs milliseconds trap, and how to convert them instantly.
A complete guide to every text case format — UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case — with use cases and a one-click converter for each.
MD5 is broken, SHA-1 is deprecated, and SHA-256 is the current standard. A clear explanation of cryptographic hash functions, what makes them secure, and how to choose the right one.
HTML entities let you display angle brackets, ampersands, and other reserved characters as literal text — and are essential for preventing XSS security vulnerabilities. A complete guide.
Word and character counts matter for SEO meta tags, social media platforms, academic submissions, and content briefs. A complete guide with a platform character limit reference table.
Your title tag and meta description are your organic search advertisement. A practical guide to writing meta tags that rank and drive clicks, with a complete reference for all SEO-relevant meta tags.
AI text summarisation condenses thousands of words into key points in seconds. Learn the difference between extractive and abstractive summaries, when to trust the output, and how to use summarisers effectively.
AI grammar checkers catch the contextual errors that basic spell checkers miss — homophones, subject-verb disagreement, dangling modifiers, and more. A practical guide to using them effectively.
AI paraphrasers restructure text at a deep level — far beyond simple synonym substitution. Learn what paraphrasing actually means, what counts as plagiarism anyway, and how to use AI tools correctly.
PDF metadata affects how documents appear in browser tabs, search results, and document management systems. Learn what fields matter, why clean metadata is important, and how to edit them.
Electronic signatures are legally valid in most jurisdictions and take under a minute to add. Learn the types of e-signatures, their legal status, and how to sign any PDF in your browser.
Fix wrong page order, rotate sideways scans, and remove blank or unwanted pages from any PDF using a visual drag-and-drop interface — no Adobe Acrobat needed.
Unlock your own password-protected PDFs instantly — no software needed. Explains the difference between user and owner passwords, and how to manage access after unlocking.
Add AES-256 encryption to any PDF in seconds. Covers the two types of PDF passwords, how strong protection really is, and best practices for sharing password-protected files securely.
Combine multiple JPG, PNG, or WebP images into a single PDF in minutes. Covers ordering, page sizing, orientation, and how to keep the final file size manageable.
Convert PDF pages to images for social media sharing, website embedding, or further editing. Includes a DPI guide for screen vs print output and a JPG vs PNG comparison.
Split any PDF by page range, equal parts, or every individual page. A comprehensive guide to when and why you need to split PDFs, with step-by-step instructions.
PDF is the professional standard for sharing documents. Learn why to use PDF over .docx, how to convert Word to PDF in your browser, and how to fix the most common conversion issues.
Convert any PDF — text-based or scanned — into an editable Word document. Explains the difference between text PDFs and image PDFs, what quality to expect, and how to fix common conversion issues.
Large PDFs are often 5–10× larger than they need to be. Learn why PDFs bloat, what compression level to choose, and how to cut file size by 50–90% without visible quality loss.
Extract the dominant hex and RGB colours from any image instantly — perfect for brand colour matching, website theming, and design inspiration. Step-by-step guide with tips for the best results.
AI screenshot-to-code tools generate functional HTML, CSS, and React code from a UI image — turning mockups and designs into working front-end code in seconds.
Memes are the internet's most shareable content format. Learn what makes a meme work, how to use popular templates, and how to create your own in under two minutes using ToolsGravity.
Modern AI OCR extracts text from images, scanned documents, and screenshots with near-perfect accuracy on printed text. Learn when to use it, how to improve accuracy, and what results to expect.
AI portrait enhancement restores sharpness, reduces noise, repairs damage, and corrects colour in old printed photos. The complete workflow for transforming faded family photographs.
AI photo colorization predicts realistic colours for greyscale photos in seconds. Learn how it works, what types of photos colorize best, and how to improve your source image for the best results.
AI inpainting fills the gap left by a removed object with convincing, contextually generated content. Step-by-step guide to removing photobombers, watermarks, and distracting elements.
AI upscaling reconstructs genuine detail rather than just interpolating pixels. Learn how it works, what it excels at, and how to get the best results from a 2× or 4× upscale.
A comprehensive comparison of JPEG, PNG, WebP, and AVIF image formats with real file size numbers, browser support data, and clear guidance on when to use each.
Platform dimension requirements for every social network, an explanation of resizing vs cropping, and a step-by-step guide to getting the exact pixel dimensions you need.
AI-powered background removal works in seconds and produces professional results even on complex edges like hair. Learn how to do it free in your browser.
From paraphrasing and grammar checks to instant summaries, these free AI writing tools handle the tedious parts of writing so you can focus on the ideas.
Need to combine multiple PDFs into one document? This step-by-step guide shows you how to merge PDFs instantly in your browser — no Acrobat needed.
Large images slow down your website and hurt your SEO. Learn the best formats, settings, and free tools to compress images without visible quality loss.
More guides coming soon.