Guides and help
Short guides about using Utilio tools, handling files, and checking results before you share them.
Popular guides
Useful starting points for common questions.
PDFBrowser-Based PDF Tools vs Upload-Based PDF ToolsPDF tools can work in two main ways. Some process the file in your browser. Others require you to upload the PDF to a server before the tool can do anything.PDFHow to Compress PDF Without Uploading ItPDF files can become too large for email, forms, support portals, or messaging apps. A PDF compressor helps reduce the file size, but many online compressors require y...PDFHow to Merge PDF Files in Your BrowserMerging PDFs is useful when several files belong together: forms, scanned pages, invoices, reports, attachments, or a document set you want to send as one file.PDFHow to Split PDF Without Uploading ItSometimes you do not need to share a whole PDF. You may only need one page, a signed section, a receipt, a form, or a small range from a larger document.
PDF tasks, document preparation, compression, merging, splitting, and result checks.
PDFBrowser-Based PDF Tools vs Upload-Based PDF ToolsPDF tools can work in two main ways. Some process the file in your browser. Others require you to upload the PDF to a server before the tool can do anything.PDFHow to Compress PDF Without Uploading ItPDF files can become too large for email, forms, support portals, or messaging apps. A PDF compressor helps reduce the file size, but many online compressors require y...PDFHow to Merge PDF Files in Your BrowserMerging PDFs is useful when several files belong together: forms, scanned pages, invoices, reports, attachments, or a document set you want to send as one file.PDFHow to Split PDF Without Uploading ItSometimes you do not need to share a whole PDF. You may only need one page, a signed section, a receipt, a form, or a small range from a larger document.PDFHow to Convert PDF to JPG LocallyConverting PDF pages to JPG helps when you need image previews, thumbnails, slides, or individual pages that can be inserted into another document or uploaded...PDFHow to Password Protect PDF in BrowserA PDF password can help limit casual access to a document before you send or store it. It is useful for files that should not be opened by anyone who gets a copy.
Images
Image compression, resizing, conversion, metadata cleanup, and sharing checks.
ImagesHow to Compress Images Without Uploading ThemLarge images are often hard to send, upload, or use on websites. A photo from a phone can be several megabytes, even when you only need it for a message, form, profile...ImagesHow to Resize Images in Your BrowserResizing changes the width and height of an image. It is useful when a file is too large for a form, a website needs a specific size, or an image should fit a layout w...ImagesHow to Convert HEIC to JPG Without UploadingHEIC is common on iPhone and some Apple devices, but not every website, form, app, or older system accepts it. JPG is usually easier to upload, send, preview, and use...ImagesHow to Remove Image Metadata Before SharingImages can contain more than pixels. A photo may include camera details, capture time, editing software, orientation data, and sometimes location metadata. Screenshots...ImagesImage Compression Quality ExplainedImage compression quality controls the tradeoff between file size and visible detail. A lower quality setting usually creates a smaller file, but it can also make the...
Developer tools
Data formats, encoding, DNS, tokens, and safer handling of technical values.
Developer toolsHow to Format JSON in Browser Without Sending It to a ServerJSON is easier to read when it is formatted. A single-line API response or config file can be hard to inspect until it is indented and highlighted.Developer toolsWhy You Should Not Paste Secrets Into Online ToolsOnline developer tools are convenient. A formatter, decoder, validator, or converter can save time when you need to inspect data quickly.Developer toolsWhat DNS Lookup Sends Over the NetworkMost Utilio tools are designed around local browser processing where possible. DNS Lookup is different. A DNS lookup needs a network request because DNS records live o...Developer toolsJWT Decoder Privacy and Security NotesA JWT can look like an ordinary encoded string, but it may contain information that matters: user IDs, email addresses, roles, scopes, expiration times, issuers, audie...Developer toolsBase64 Decode Locally: What It MeansBase64 is often used to represent data as text. You may see it in API payloads, email data, tokens, configuration files, images, certificates, or logs.
File viewers
Opening DOCX, XLSX, CSV, PPTX, JSON, and other files without unnecessary server upload.
File viewersHow to Open DOCX Without Microsoft WordYou do not always need Microsoft Word just to read a .docx file. If you only need to open the document, check the text, review the layout, or copy a small part of the...File viewersHow to View a DOCX File Without Uploading ItMany online document viewers work by uploading your file to a server first. That may be fine for ordinary documents, but it is not always what you want for contracts,...File viewersHow to Open XLSX Online Without Uploading FilesUtilio's XLSX Viewer is temporarily paused while the spreadsheet parser is replaced. Use a trusted spreadsheet app for XLSX/XLS, or CSV Viewer for CSV/TSV files.File viewersHow to View CSV Files in Your BrowserCSV files are simple, but they can be hard to read as plain text. A row with many commas, quoted values, or long fields is easier to inspect when the file is shown as...File viewersHow to Open PPTX Without PowerPointYou do not always need PowerPoint just to preview a .pptx file. If you only need to check the slides, read the content, or confirm what a presentation contains, a brow...File viewersHow to Open JSON Files Privately in Your BrowserJSON files are plain text, but that does not mean they are always safe to share. A JSON file can contain API responses, exports, configuration, logs, tokens, user reco...