Sixteen free online web development tools — a meta tag generator with live share previews, schema and robots.txt generators, URL slug and UTM builders, keyword density analyser, lorem ipsum and HTML table generators, text case and PX-to-REM converters, colour palette, gradient and box shadow generators, aspect ratio calculator, and a WCAG contrast checker. Nothing you type ever leaves your device.
FrontendHelpers is a free collection of sixteen browser-based utilities built for frontend web developers, SEO specialists and designers. Every tool runs entirely in your browser using client-side JavaScript — nothing you type is ever sent to a server, which means your meta descriptions, business details, colour choices and campaign URLs stay completely private.
The collection covers the two things developers waste the most time on: SEO markup and CSS design decisions. On the SEO side, you can generate meta tags with live Google, Facebook and X preview cards; build JSON-LD schema markup for local businesses, articles and products; create clean URL slugs; assemble UTM campaign links; generate a robots.txt with the correct directives; and run a keyword density check against your copy. On the design side, there's a colour palette generator that outputs tint and shade scales with CSS custom properties; a CSS gradient builder with radial, conic and linear modes; a box shadow designer with layered shadows; a WCAG contrast checker that reports against all four AA and AAA thresholds; a PX-to-REM converter; and an aspect ratio calculator for responsive images and video embeds.
Every tool produces copy-paste ready output — valid HTML meta tags, complete JSON-LD blocks, working CSS declarations — so you spend time building, not reformatting. The interface is designed to be beginner-friendly while generating production-quality code: character counters warn when a title is too long, live previews show exactly how a social card will render, and inline explanations link each setting to the standard it follows.
FrontendHelpers is more than a toolbox. The CSS animation library contains 72 production-ready animations across eleven categories — loading spinners, hover effects, entrance transitions, text reveals, form interactions, accordions, image galleries, menus, UI feedback, attention-getters and background effects — each previewed live and explained with the CSS that makes it work. The JavaScript tricks collection covers 32 modern patterns from structuredClone to event delegation, with runnable in-page demos you can experiment with. And a set of in-depth guides walks through the problems developers actually get stuck on: why a site isn't appearing on Google, how to pass Core Web Vitals, building accessible interfaces, implementing dark mode, and the steps for a successful website launch.
The site is supported by a small number of non-intrusive ads, never by paywalls or gated features. Every tool, animation, snippet and guide is free to use in personal and commercial projects, with no attribution required.
Type in your webpage details to see how they appear when shared on Google, Facebook, and Twitter. Grab the optimised HTML tags.
Meta tags don't rank you directly — they decide whether your result gets clicked, and whether a shared link becomes a rich card or a bare URL.
Full guide: title length, Open Graph and fixing stale previews →
Generate schema.org markup for local services or businesses. Structured schema helps Google display rich search results (reviews, price metrics, maps).
Structured data states explicitly what your page represents, making it eligible for rich results — star ratings, business details, FAQ dropdowns.
Full guide: JSON-LD, rich results and the rule that gets sites penalised →
Turn any headline into a clean, lowercase, hyphen-separated URL slug — the format search engines and readers both prefer.
Google reads hyphens as word separators and underscores as joiners, so css-animations is two words while css_animations is one meaningless token.
Full guide: stop words, accents and why you must never change a live slug →
Convert any text between the six cases developers juggle daily — camelCase for JavaScript, kebab-case for CSS and URLs, snake_case for databases, and more.
Mixed input is fine — existing camelCase, hyphens, underscores and spaces are all understood and re-split into words first.
Each convention exists because of a constraint: JavaScript can't use hyphens, URLs are case-insensitive, SQL folds identifiers to lowercase.
Build tracking links for newsletters, social posts and ads — so Google Analytics can tell you exactly which campaign brought each visitor.
UTM tags let analytics tell you which campaign, channel and individual link brought each visitor — instead of lumping them into 'direct'.
Full guide: source vs medium, naming conventions and internal-link traps →
Create a valid robots.txt that tells search engine crawlers what to index and what to skip — plus your sitemap location.
robots.txt controls crawling, not indexing — a distinction that causes more accidental SEO damage than any other misunderstanding.
Full guide: the line that deindexes sites, and why it can't hide anything →
Paste your article or page copy to get word counts, estimated reading time, and the keywords you actually repeat most — all analysed locally in your browser.
| Word | Count | Density |
|---|---|---|
| Paste some content to analyse it. | ||
There is no magic density percentage — modern search engines model meaning, not term frequency. Density is a diagnostic, not a target.
Full guide: natural density, reading time and matching search intent →
Generate placeholder text for mockups and layouts — by paragraph, sentence or word count, ready to copy.
Placeholder text keeps a design review focused on spacing, hierarchy and typography instead of the words — but it must never reach production.
Convert special characters to safe HTML entities and back — for displaying code snippets, avoiding broken markup, and preventing injected HTML.
Escaping output is the primary defence against XSS: the same input that would execute as a script renders as harmless visible text.
Full guide: the five reserved characters, named vs numeric, and decoding →
Build clean, semantic table markup — with a proper header row and accessible scope attributes — plus a starter stylesheet to make it look right.
Screen readers navigate cell by cell and rely on thead and scope to announce which header each value belongs to.
Full guide: accessibility, the layout-tables myth and responsive strategies →
Instantly convert between pixel sizes and proportional REM spacing units, based on a custom document root font size.
| Pixels | REM |
|---|
REM units scale with the visitor's browser font-size preference, so text stays readable when someone increases their default size — something pixel values ignore, failing WCAG 1.4.4.
Find an image or video's aspect ratio, scale it to any width without distortion, and copy the CSS and HTML that stop layout shift.
Telling the browser an image's dimensions up front reserves its space and prevents the page jumping as it loads — the cause of poor CLS scores.
Full guide: standard ratios, object-fit and the aspect-ratio property →
Turn one brand colour into a full working palette: a 50–900 tint-and-shade scale, complementary and analogous accents, and ready-made CSS design tokens.
The complement sits opposite your colour on the wheel — highest contrast for call-to-action moments. Analogous neighbours harmonise for backgrounds and secondary UI.
Professional palettes are one hue expressed at many lightness levels, named as tokens — which is what makes a rebrand a five-minute change.
Build beautiful CSS gradients visually with a live preview. Adjust colours, angles, and stops, then copy the CSS code.
Browser-rendered gradients cost no bandwidth, stay sharp at any resolution, and can be restyled in a second — everything a gradient image cannot do.
Full guide: linear vs radial, colour stops and performance →
Design custom box shadows with visual sliders. Adjust offset, blur, spread, and colour for the perfect shadow effect.
Shadows create depth and hierarchy in flat interfaces. The professional look comes from low opacity, generous blur and a slight downward offset.
Full guide: layering shadows, elevation scales and dark mode →
Check if your text and background colour combination meets WCAG 2.1 accessibility standards for AA and AAA compliance.
This is what your body text will look like with these colour combinations. Check if it's easily readable at this size.
Small text (12px) is harder to read and needs higher contrast ratios to pass WCAG compliance.Contrast ratio compares perceived brightness. AA needs 4.5:1 for normal text — the level UK and EU law reference.
Full guide: the four thresholds and the mistakes that fail audits →
The toolbox doesn’t stop here — two more libraries, same rules: free, copy-paste ready, no sign-up.
Entrances, hover effects, loaders, forms, accordions, carousels and menus — every preview runs live on pure CSS, and the code you copy is exactly what you saw.
Browse the animation gallery → JavaScript LibraryFrom structuredClone to event delegation and debouncing — each snippet explains why professionals reach for it, with runnable in-page demos.
Explore the JS tricks → Knowledge BaseSecurity, performance, accessibility, Git, deployment and more — with interactive checklists that track your progress, plus an honest builders-vs-code guide.
Start the essentials →Longer guides that go deeper on the topics these tools cover — each one written to solve a specific problem you're likely to hit.
A step-by-step diagnostic that finds the cause about 80% of the time — from robots.txt mistakes and noindex tags to thin content and rendering problems.
Read the guide → PerformanceLCP, INP and CLS explained in plain language, with the fixes that move the needle fastest on real projects.
Read the guide → AccessibilitySemantic HTML, keyboard navigation, ARIA, colour contrast and the automated checks that catch the most common failures.
Read the guide → CSSCSS custom properties, prefers-color-scheme, toggling without flicker, and the design decisions that make dark mode actually look good.
Read the guide → PerformanceWhy some properties animate smoothly and others cause jank — compositor layers, will-change, and the tools to measure it.
Read the guide → LaunchEverything to verify before you push to production — from HTTPS and canonical tags to analytics, favicons and social share images.
Read the guide →Yes — every tool on FrontendHelpers is completely free, with no sign-up, no account and no usage limits. The site is supported by a small number of unobtrusive sponsorships, never by paywalls.
No. All six tools run entirely in your browser using client-side JavaScript. Meta descriptions, business details, colours — nothing you enter is transmitted, stored or logged anywhere.
Absolutely. Everything the tools generate — meta tags, JSON-LD schema, gradient and shadow CSS — plus every snippet in the animation library and JS tricks collection is yours to use in personal and commercial work, with no attribution required.
Meta tags control how your pages appear in Google results and social feeds. A well-written title under 60 characters and description under 160 characters improves click-through rate, while Open Graph tags turn plain shared links into rich visual cards on Facebook, LinkedIn and X.
It implements the official WCAG 2.1 relative-luminance formula — the same maths used by browser DevTools and audit tools like Lighthouse — and reports pass/fail against all four thresholds: AA and AAA, for normal and large text.