Há ferramentas online que ajudam a resolver problemas de forma rápida, como os conversores de PDF, mas é preciso considerar os riscos que a sua utilização pode trazer, alerta Samuel Cruz.
The post Converter um PDF online: quando um gesto simples pode expor informação confidencial appeared first on Tek Notícias.
iPhone Preview brings everyday PDF tasks into one built-in app, from rearranging pages to preparing a smaller attachment. Introduced with iOS 26, it remains available in iOS 27, whose user guide provides the instructions used here.
Apple’s Preview app can open PDFs directly, reorganize their pages, rotate or crop individual sheets, delete unwanted pages, insert new ones, complete forms, add signatures, protect documents with passwords and export smaller copies for sharing.
It can also scan paper documents directly into a PDF and combine multiple pages into one file.
That makes Preview surprisingly capable for common workflows such as signing a contract, cleaning up a scanned document, reducing an attachment before emailing it or rearranging pages in a report.
Start with the task your document requires. Rearranging pages, adding a signature and preparing an attachment are different from rewriting an existing paragraph or meeting a publisher’s production requirements. Preview’s documented tools cover many routine changes, while more specialized work may require a separate editor.
Page management is particularly useful for scanned documents. A report may contain a sideways sheet, an attachment in the wrong position or an empty page that needs removing before the file is shared.
Open a document in Preview and tap the page count to reveal its thumbnail view.
From there, a page can be moved simply by touching and holding its thumbnail and dragging it above or below another page.
That makes fixing a scanned contract or report straightforward when pages were captured in the wrong order.
Preview > open PDF > tap page count > touch and hold a page thumbnail > drag it into position
The same thumbnail menu can delete a page entirely.
Touch and hold the unwanted thumbnail, then choose Delete Page.
Preview can also insert material into an existing document. The thumbnail menu offers options to add a blank page, import a PDF or image from Files, or scan additional paper pages with the iPhone camera.
That means a form missing one attachment can be repaired without recreating the complete PDF.
Rotation is equally direct.
Open the relevant page, tap the More button and choose Rotate Left or Rotate Right.
Preview > open PDF > select page > Crop > adjust the blue handles > Crop
This is particularly useful for scanned pages with oversized borders, desk surfaces or other material around the document.
Apple also provides Undo through the More menu, making these edits less intimidating when working on an original file. For documents that cannot easily be replaced, creating a duplicate first remains the safer approach.
Preview also consolidates several document tasks that iPhone users may already recognize from Markup.
Fillable PDF forms can be completed directly inside the app. Text fields, checkboxes and other supported form elements can be selected and edited without converting the file into another format.
Signatures use Apple’s familiar Markup system.
Open the document’s signature controls and choose Add Signature. When using Markup, tap the Add (+) button first, then select Add Signature. Choose a saved signature or draw a new one with your finger; rotating the iPhone gives you more room.
A saved signature can then be positioned and resized on the document.
For recurring paperwork, that makes Preview useful for forms that arrive through Mail or Files and need to be returned quickly.
Once a document has been completed, Preview can also password-protect it.
Preview > open PDF > Actions menu beside filename > Lock
Enter the same password in the Password and Verify fields, then confirm the change.
Apple automatically enables the password requirement when the file is locked.
This protection prevents someone without the password from opening the PDF normally and helps protect completed work from unauthorized access.
There is an important practical step before doing this: duplicate the document if you want to preserve an unprotected copy.
Preview > Actions menu > Duplicate
A password-protected PDF is only useful if the password itself can be recovered later. Losing it can make the document inaccessible, so the credential should be stored somewhere secure.
Large PDFs are another problem Preview addresses without requiring a separate compression website.
Open the document, tap the Actions menu beside its filename and choose Export.
When PDF is selected as the output format, iOS 27 offers several options that can reduce file size.
Optimize Images for Screen lowers image resolution for documents intended primarily for display rather than high-quality printing.
Save Images as JPEG can reduce the size of embedded images further by using JPEG compression.
Two other export options serve different purposes. Create Linearized PDF optimizes a document for faster web loading, while Embed Text applies optical character recognition, or OCR, to make image-based content searchable.
Choose those options for loading behavior or searchability, rather than assuming they will produce the smallest attachment. For file-size reduction, the image optimization settings are the relevant controls.
Preview > open PDF > Actions menu > Export > PDF > Optimize Images for Screen > Save
Adding Save Images as JPEG can shrink image-heavy files further when maximum image fidelity is unnecessary.
These image-reduction options can sacrifice detail. Lowering resolution or using JPEG compression may affect small text, fine lines and photographs, so compare the exported copy with the original before sending it.
A document containing mostly text may shrink only modestly. A scan filled with high-resolution photographs can show a much larger reduction.
Preview also exports files into formats including HEIC, JPEG, PNG and TIFF when a PDF needs to become an image instead.
When exporting a PDF to an image format, resolution can be selected manually, giving users additional control over the balance between detail and file size.
Reopen the exported file before sending it. Check the page order, orientation, completed fields and signature placement. Zoom in on small text and diagrams, especially if you reduced image resolution. The useful result is a document that remains readable and complete, not simply the smallest file you can create.
Keep the original under a different filename so you can produce another version if needed. A copy prepared for email may not be the best version for printing or archiving. Names such as “Application — Original” and “Application — Email Copy” help distinguish the files when they appear together in Recents.
If the task involves changing existing document text or satisfying a specific submission requirement, confirm that your chosen tool supports it before proceeding. For routine page organization, form completion and sharing, a checked Preview export may be all you need.
The post iPhone Preview Can Lock, Compress and Reorder PDFs Without Adobe appeared first on AppleMagazine.
Toni Sagrista Selles (Hacker News):
In a dramatic turn of events, the Chromium team has reversed its
Obsoletetag, and has decided to support the format in Blink (the engine behind Chrome/Chromium/Edge). Given Chrome’s position in the browser market share, I predict the format will become a de factor standard for images in the near future.[…]
I’ve been following JPEG XL since its experimental support in Blink. What started as a promising feature was quickly axed by the team in a bizarre and ridiculous manner. First, they asked the community for feedback on the format. Then, the community responded very positively. And I don’t only mean a couple of guys in their basement. Meta, Intel, Cloudinary, Adobe,
ffmpeg,libvips, Krita, and many more. After that came the infamous comment[…][…]
To top it off, a couple of weeks ago, the PDF Association announced their intent to adopt JPEG XL as a preferred image format in their PDF specification.
JPEG-XL image support is back in the very latest Google Chrome/Chromium codebase. Back in December they merged jxl-rs as a pure Rust-based JPEG-XL image decoder from the official libjxl organization. At the end of December they did more JPEG-XL plumbing with the enums and build flags for the support.
Luca Versari et al. (via Jarek Duda):
We’re excited to announce that Chrome is shipping decoding support for the JPEG XL (
.jxl) image format starting from Chrome 155. JPEG XL is a next-generation image format designed to meet the needs of modern web developers and photographers. It offers 30-50% better compression than JPEG, lossless compression, built-in HDR support, lossless JPEG transcoding, and more.In general, we recommend trying both AVIF and JPEG XL to get the best results. We expect that JPEG XL is most helpful for high-fidelity or lossless compression, especially of photographic images or in cases in which fine-grained progressive decoding is preferred.
Previously:
EagleFiler 1.9.22 is a maintenance release of my Mac file/note organizer and e-mail archiving app. This version works around various bugs in macOS 27, adds capture support for the Thorium Web browser, and improves importing from Mariner Paperless.
macOS 27 broke several things with drag and drop out of Apple Mail. Simply trying to read a URL from the pasteboard will cause a hang while it waits forever for the pasteboard server (FB24803817). The same thing happens when using PasteboardSetPasteLocation() and reading kPasteboardTypeFileURLPromise directly, which I was doing (instead of using newer API) to work around bugs in older versions of macOS. EagleFiler now uses NSFilePromiseReceiver for drags from Mail on macOS 27, which works better, but I also had to work around a bug where Mail would promise superfluous files for which the reader callback was never invoked at all.
macOS 27 also seems to include various regressions when reading PDF and Word files, producing invalid strings containing NUL characters. Also, displaying certain PDF files worked fine on macOS 26 but now crashes.
I also ran into (and worked around) a bug where macOS 27’s NSTextView would get into an infinite layout loop when displaying an attributed string that included images.
Drag and drop from Airmail is still an issue. When using the newer drag APIs, it will often hang Airmail or not produce a file, and this also happens with other apps like Finder as the destination. EagleFiler works around this using older APIs with Airmail and tries to report a helpful error when there’s trouble. Single-message drags work best.
I’ve also been investigating a problem where saving a file with a colored tag in iCloud Drive will, a few seconds later, change the color to gray, but I don’t have a solution for this.
Previously:
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