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DevToolKit
Practical PDF, image, developer, and everyday tools

Clearly labeled processing for everyday tasks.

Core processing runs in the browser for most tools. Server-backed and external-provider workflows are labeled separately. Basic tools are available without signup; individual limits vary by tool.

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© 2026 DevToolKit. Practical PDF, image, developer, and everyday tools with clearly labeled processing.

In-browserServer-backedExternal preview
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Everyday Tools

Simple tools for everyday tasks

Count text, convert measurements, calculate calendar age, compare supported time zones, and preview YouTube-hosted thumbnails. Thumbnail previews load from YouTube’s image service.

Count wordsConvert units
Age calculatorTime zonesYouTube thumbnails·Browse all general tools
5 everyday toolsQuick resultsBrowser-basedNo signup

Quick task preview

No signupQuick resultsBrowser-based
  1. 1

    Writing

    Enter or import TXTCount statisticsCopy text or stats
  2. 2

    Convert

    Choose a categoryEnter a numberReview the converted result
  3. 3

    Time zones

    Choose supported zonesSet a date and timeReview the converted date
  4. 4

    Age

    Enter a birth dateChoose the reference dateReview calendar age
  5. 5

    YouTube thumbnails

    Paste a supported URL or video IDPreview available variantsOpen or copy a thumbnail link

Start with a common task

Jump straight into the tool you need — no account required for everyday use.

No signup required
Word CounterEssays & draftsUnit ConverterTravel & cookingTime Zone ConverterMeetingsAge CalculatorForms & milestonesYouTube ThumbnailsPermitted reference

Choose your everyday workflow

Pick a use case — each opens the right tool for the task.

Writing & drafts

Check word limits, characters, sentences, and estimated reading or speaking time.

Enter or import TXTCount statisticsCopy text or stats

Travel & units

Convert between the implemented length, weight, temperature, area, volume, and speed units.

Choose a categoryEnter a numberReview the converted result

Meetings & time zones

Convert a selected date and time between supported city and IANA zones.

Choose supported zonesSet a date and timeReview the converted date

Age & birthdays

Calculate calendar age, birthday timing, and date differences for a selected reference date.

Enter a birth dateChoose the reference dateReview calendar age

YouTube thumbnails

Preview the five implemented YouTube-hosted JPG thumbnail variants for a supported URL or video ID.

Paste a supported URL or video IDPreview available variantsOpen or copy a thumbnail link
Writing & textConvertersMedia & thumbnails

Writing & text

Count words, characters, sentences, paragraphs, lines, and estimated reading or speaking time.

1 tool

Word Counter

Count words, characters, sentences, paragraphs, lines, and estimated reading or speaking time.

In-browser

Converters & calculators

Convert measurements and supported time zones, or calculate calendar age on a selected date.

3 tools

Unit Converter

Convert between the implemented length, weight, temperature, area, volume, and speed units.

In-browser

Time Zone Converter

Convert a selected date and time between supported city and IANA zones.

In-browser

Age Calculator

Calculate calendar age and birthday information for a selected reference date.

In-browser

Media & thumbnails

Preview YouTube-hosted JPG thumbnail variants and open or copy an available image link.

1 tool

YouTube Thumbnail Downloader

Preview five YouTube-hosted JPG thumbnail variants and open or copy an available image link.

CDN preview

Not sure where to start?

Jump to popular tools or follow a recommended writing workflow.

Most used general tools

  • Word CounterWriting & draftsIn-browser
  • Unit ConverterMeasurementsIn-browser
  • Time Zone ConverterRemote teamsIn-browser
  • Age CalculatorForms & recordsIn-browser

Best for

Essays and character limitsEveryday measurement conversionRemote meeting planningCalendar-age and birthday checksPermitted thumbnail reference

Recommended next workflow

A common path for essays, drafts, and social captions.

Enter or import TXTCount statisticsCopy text or stats

Paste text → Count stats → Copy results

Start workflow

How these tools run

Browser calculations

Text stats, units, age, and time zones run in the browser.

CDN thumbnail previews

YouTube thumbnails load from i.ytimg.com after local parsing.

No AI required

Focused utilities without AI for their core functions.

5 tools·No signup required

How to choose the right tool

Students, writers, and everyday users who need word counts, converters, calculators, and lightweight utilities without installing apps.

Match your everyday task to the fastest utility.

  • Check word or character countWord Counter
  • Convert miles, kg, or °CUnit Converter
  • Compare meeting timesTime Zone Converter
  • Calculate calendar ageAge Calculator
  • Preview YouTube thumbnail variantsThumbnail Downloader

Related guides

  • Useful developer tools every browser should have

FAQ

Quick answers about speed, privacy, and accounts.

Do I need an account?

No signup is required for basic tools today.

Which tools run in the browser?

Word counting, unit conversion, age calculation, and time-zone conversion run in your browser. YouTube thumbnail previews load from YouTube.

Do general tools need file uploads?

Most tools accept typed numbers or text. Only Word Counter supports optional .txt import up to 5 MB.

Are all cities and time zones available?

No. Time Zone Converter uses a curated list of supported city and IANA zones.

Do YouTube thumbnail previews require an external request?

Yes. Previews load images from YouTube after local parsing.

Does the YouTube tool download videos?

No. It previews thumbnail variants and lets you open or copy an image link.

Does DevToolKit use AI for general tools?

No. These utilities do not use AI for their core functions.

Built for speed and simplicity

Everyday utilities should stay focused — no account required, and no AI needed for their core functions.

Local text and calculations

Word counting, measurement conversion, age calculation, and time-zone conversion run in the browser. Only Word Counter supports optional .txt import up to 5 MB.

External thumbnail retrieval

YouTube thumbnail lookup parses input locally, but previews load images from YouTube’s CDN at i.ytimg.com. Saving uses browser controls where permitted.

Analytics and ordinary requests

Site assets and identified analytics may still generate ordinary network requests. The category is not fully offline.

Related workspaces

Need file processing, images, or developer utilities?

Developer Workbench

JSON, JWT, regex, Base64, and text diff tools.

Image Studio

Compress, convert, and edit images.

PDF Workspace

Merge, compress, and convert PDF documents.

5 everyday tools·Privacy & trust