PWA Manifest Installability Predictor
Check a web app manifest against common installability criteria and understand why a PWA install prompt may not appear.
Local processing. Practical tools. No friction.
Specialized browser tools that keep your work on your device
ClientSideTools helps developers, SEO professionals, accessibility practitioners, publishers, and technical writers solve narrow workflow problems without unnecessary uploads, accounts, or permissions.
No account. No API key. No installation. Your input is processed in your browser whenever technically possible.
Privacy-first: tool input is not sent to ClientSideTools servers.
Featured tools
A focused set of production tools for common, frustrating workflow problems.
Font size-adjust & ascent-override Calibrator
Calculate fallback font metric overrides to reduce Cumulative Layout Shift caused by web font loading.
JSON-LD Nested Entity Builder
Build structured data with nested entities more safely, without hand-editing large JSON blocks.
ARIA Landmark & Heading Hierarchy Auditor
Review heading structure and landmark organization to support more predictable screen-reader navigation.
Content Security Policy Hash & Nonce Generator
Generate hashes for inline scripts and styles while building a stricter Content Security Policy.
Code Snippet Redactor & PII Scrubber
Detect and redact likely secrets, emails, and personal data before pasting code into an AI prompt.
Tool categories
Six focused clusters built for depth rather than generic tool directories.
SVG & CSS Engineering
Fonts, layout shift, SVG paths, masks, clipping, grids, and modern CSS workflows.
8 tools
Web Accessibility
Headings, landmarks, contrast, focus, touch targets, motion, and screen-reader text.
7 tools
PWA & Browser Storage
Manifests, installability, service workers, storage quotas, sharing, and notifications.
7 tools
Technical SEO & Metadata
Schema, canonicals, hreflang, robots directives, social images, and link analysis.
7 tools
Privacy, Security & Web APIs
CSP, CORS, SRI, Permissions Policy, cookies, partitioned storage, and WebRTC privacy.
6 tools
AI Workflows & Technical Writing
Prompt sanitization, token estimation, commit messages, documentation quality, and schema from Markdown.
5 tools
Recently added tools
Newly available utilities from the Version 1.0 launch set.
CORS Preflight Debugger
Understand why a cross-origin request may fail and inspect the headers involved in preflight behavior.
Canonical & Hreflang Link Checker
Validate reciprocal hreflang references and identify canonical conflicts from pasted markup.
Color Contrast Matrix Generator
Compare palette combinations against WCAG contrast expectations for text and UI components.
Open Graph Safe-Zone Cropper
Preview social sharing images against common safe zones before publishing.
SVG Path Data Minifier
Clean noisy SVG path data and reduce unnecessary precision before embedding icons or illustrations.
LLM Context Window Token Estimator
Estimate token usage before sending documentation, prompts, or long text blocks to an AI model.
Why local processing matters
Many small tasks do not require a server round trip. ClientSideTools keeps the work in the browser whenever the platform allows it.
No unnecessary uploads
Pasted code, markup, JSON, text, and local files are processed using browser APIs. They are not transmitted to ClientSideTools servers as part of normal tool use.
No account friction
There is no signup, no login, no API key, and no installation. Open the tool, solve the problem, copy the result, and continue working.
Honest limitations
Some tools may need to request a URL you explicitly provide, such as checking a remote resource. When a feature uses the network, that behavior is explained on the tool page.
How local processing works
ClientSideTools uses standard web platform capabilities rather than opaque server processing.
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You provide the input
Paste markup, JSON, CSS, text, or select a local file. The input belongs to your browser session.
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Your browser does the work
The tool uses native APIs such as DOM parsing, Canvas, File access, Clipboard, Crypto, and structured validation logic.
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You keep the result
Copy, download, or reuse the output. The workflow stays on your device unless you explicitly use a feature that requires a network request.
Popular workflows
Start with a real task, not a generic utility.
Debug a missing PWA install button
Check manifest fields, icons, and installability signals before digging through browser logs.
Fix font-related layout shift
Generate fallback font metric overrides for more stable text rendering.
Build nested structured data
Create JSON-LD entities with fewer syntax mistakes and clearer relationships.
Audit heading structure
Understand whether page landmarks and headings create a usable document outline.
Prepare a strict CSP
Hash inline scripts and styles so you can tighten Content Security Policy without breaking the page.
Sanitize code before AI prompts
Reduce the chance of sharing credentials, personal data, or internal identifiers with an LLM.
Learn while you work
Each tool page explains the problem, the browser behavior, and the practical limits of the technique.
Browser storage and app behavior
Learn how manifests, service workers, quotas, and installation rules fit together in real products.
Accessibility as a workflow
Move beyond checklists with tools that reveal structure, contrast, focus, touch targets, and motion risks.
Web security headers
Understand CSP, Permissions Policy, CORS, SRI, and related browser protections in a practical context.
About ClientSideTools
ClientSideTools is published by Nasimul Haq. The site is built as a static, privacy-conscious productivity platform for people who work with the web: developers, SEO professionals, accessibility practitioners, publishers, PWA developers, technical writers, and privacy-conscious users.
The goal is not to become another directory of disposable utilities. The goal is to build carefully selected micro-tools that solve narrow problems well, explain how they work, and respect the user’s data.
Questions, feedback, and corrections can be sent to mdnasimulhaq25@gmail.com.
Version 1.0.0 · Last updated August 8, 2026
Frequently asked questions
Short, honest answers about how ClientSideTools works.
Is my data uploaded to your servers?
Whenever technically possible, no. Tool inputs are processed in your browser using standard web APIs. ClientSideTools does not require an upload step for normal tool operation.
If a specific tool needs to fetch a remote resource, that happens only when you provide the URL and the behavior is explained on that tool’s page.
Do I need an account or API key?
No. ClientSideTools is designed around no signup, no login, no API key, and no installation.
Does the site work offline?
ClientSideTools is designed as a static, offline-friendly site. Full offline availability depends on browser caching, service worker support, and whether the page was previously visited.
Are the tools free to use?
Yes. The tools are free to use for personal and professional work, subject to the Terms & Conditions.
Which browsers are supported?
ClientSideTools targets current versions of major browsers, including Chrome, Edge, Firefox, and Safari. Some advanced browser APIs may behave differently across browsers, and each tool page documents relevant limitations.
Can I suggest a tool?
Yes. Send a description of the workflow problem to mdnasimulhaq25@gmail.com. Suggestions are evaluated based on real user need, privacy feasibility, and implementation quality.