Practical privacy guides

Guides

Tell CASTARA what you have and what you need

Start with the input file you already have, then choose the tool named for the result you want.

Use the tools without registering. An account adds convenience and rewards; it is not required for core conversion.

Explore tools
  1. 1. Identify your current file type.
  2. 2. Choose the output or action you need.
  3. 3. Select files only when the tool confirms the accepted formats.
  4. 4. Review and download the result before relying on it.

All tools

Choose a tool for your task

Explore every CASTARA tool by category. Open a tool to review its supported files, options and limits before processing.

Image tools

Compress, resize and change image formats.

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Image CompressorShrink JPEG, PNG and WebP files with quality and dimension controls.Image ResizerResize images using contain, cover or exact dimensions.Image ConverterChange JPEG, PNG and WebP images to the format you need.Image OCRExtract English text from JPEG, PNG and WebP images privately in your browser.Price Tag MakerDesign a clear custom price tag with simple templates and download it as PNG.

GIF & animation tools

Create GIFs or extract their individual frames.

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Images to GIFTurn JPEG, PNG and WebP images into an animated GIF.GIF to ImagesExtract GIF frames as PNG, JPEG or WebP images.

PDF tools

Create, combine, split, rotate and reorder PDFs.

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Images to PDFArrange images and create a single downloadable PDF.PDF OCRExtract reliable English text from scanned or selectable PDF pages privately in your browser.Merge PDFCombine several PDF files in your chosen order.Split PDFExtract ranges, individual pages or fixed-size groups.Rotate PDFRotate selected pages left, right or 180 degrees.Reorder PDFRearrange PDF pages with keyboard-friendly controls.Remove PDF PagesSelect unwanted pages and create a PDF containing the rest.Extract PDF PagesCopy selected pages into one PDF or separate PDF files.Add PDF Page NumbersNumber selected pages with configurable placement and styling.Watermark PDFApply a text or image watermark to selected PDF pages.PDF to JPG or PNGRender selected PDF pages as JPG or PNG images.Crop PDFAdjust the visible crop area of selected PDF pages.Basic PDF EditorAdd text, images, shapes, drawings and highlights to a PDF.Fill PDF FormsComplete supported fields in an existing interactive PDF form.Add a Visual SignatureDraw, type or upload a visual electronic signature.View and Edit PDF MetadataReview and update supported PDF document metadata.

Audio Tools

Edit, convert, improve, record, and manage audio files directly from your device.

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Audio TrimmerSelect and export a precise section of an audio file.Audio SplitterSplit audio at one or more timestamps and download each part.Audio MergerArrange compatible audio files and join them into one track.Volume ChangerRaise, lower or mute audio with a preview before export.Fade In and Fade OutAdd adjustable fade-in and fade-out effects to audio.Audio ReverserReverse a short audio file entirely on your device.Mono and Stereo ConverterMix stereo audio to mono or duplicate mono into stereo.Audio Waveform GeneratorCreate and download a PNG waveform without uploading audio.Audio Metadata ViewerInspect duration, format, sample rate and channel information.Voice RecorderRecord, pause, preview and download audio in your browser.Audio NormalizerAdjust peak volume locally for more consistent playback.

Video Tools

Trim, convert, resize, edit, and manage videos with simple browser-based tools.

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Video to GIFCreate an animated GIF from an MP4, M4V, MOV or WebM clip.Video to AudioExtract audio from MP4, M4V, MOV or WebM and save it as MP3 or WAV.Video Metadata ViewerInspect a video's duration, dimensions and available format details.Video TrimmerSelect a short section and export it locally in a browser-supported format.Mute VideoCreate a silent copy of a video without sending it to a server.Video Thumbnail GeneratorChoose a video frame and download it as PNG, JPEG or WebP.Video Frame ExtractorExtract a controlled number of frames at regular intervals.Subtitle ConverterValidate and convert SRT and WebVTT subtitle files locally.Screen RecorderRecord a screen or window after you grant browser permission.Webcam RecorderRecord camera and optional microphone input with a local preview.

Text tools

Organize and transform plain text in your browser.

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Split TextSeparate text with a common or custom delimiter and keep every resulting segment.

QR & barcode tools

Create scan-ready QR codes and standard barcodes.

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QR Code & Barcode GeneratorCreate customized, scan-ready QR codes and standard barcodes in your browser.

Developer Tools

Format, encode, generate and verify developer-friendly values.

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JSON FormatterValidate, format or minify JSON with clear syntax errors.XML FormatterValidate, indent or minify XML directly in your browser.Base64 Encoder & DecoderEncode Unicode text or decode standard, unpadded and URL-safe Base64.URL Encoder & DecoderEncode or decode URL components without sending them anywhere.UUID GeneratorGenerate one or more cryptographically random UUID v4 values.Hash & Checksum GeneratorCreate SHA-256, SHA-384, SHA-512 or CRC32 values from text.Password GeneratorCreate strong, customizable passwords with cryptographically secure randomness.

Calculators

Calculate dates, percentages, conversions, prices and payments.

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Standard CalculatorHandle everyday arithmetic, percentages, parentheses and common mathematical operations.Percentage CalculatorCalculate percentages, ratios and percentage changes.Age CalculatorFind an exact age in years, months and days.Date Difference CalculatorCount the days and complete weeks between two dates.Time Duration CalculatorMeasure elapsed time and subtract an optional break.Unit ConverterConvert common length, mass, temperature and volume units.Discount CalculatorCalculate savings, optional sales tax and the final discounted price.Malaysia Bank Loan Rate & Loan CalculatorEstimate a home budget from salary, compare payment-compatible Malaysian bank rates, and calculate repayments.

Step-by-step guides

How to compress images safely

Reduce image size while keeping quality, privacy and the final use in mind.

Read guide

JPG vs PNG vs WebP

The best image format depends on content, transparency and compatibility.

Read guide

How to reduce image size for email

A smaller pixel size often saves more space than aggressive quality reduction.

Read guide

How to merge PDFs privately

Combine documents carefully while keeping privacy and accuracy in mind.

Read guide

How to split PDF pages

Extract a range or create one document for each page.

Read guide

How to protect privacy when working with files

Careful file handling can reduce unnecessary exposure of private information.

Read guide

How to prepare images for online forms

Match a form's dimensions, format and file-size limit before submitting.

Read guide

How to convert images into one PDF

Turn a sequence of scans or photographs into a single document.

Read guide

How to choose the right CASTARA tool

Start with the file you already have and the result you want to create.

Read guide

How to split and format text

Separate pasted text into useful segments and format the complete result in your browser.

Read guide

How to create a reliable QR code

Choose suitable content, contrast, size and quiet space so people can scan your QR code reliably.

Read guide

How to create and validate a barcode

Select the correct barcode standard and verify its length, characters and check digit before use.

Read guide